Bollettino SPI Vol. 23 - Issues 1, 2, 3
Issue 1
Published in April 1985
- Conti S. & Serpagli E. (1984)
A new interpretation of the anthozoan Septodaeum Bischoff, 1978 as a bryozoan
pp. 3-20
Taxonomically significant morphological and structural features of the Lower Palaeozoic genus Septodaeum Bischoff were discussed by the Authors in a short account in 1982 (IV International Symposium on the Ordovician System, held in Norway). At that time the Authors presented preliminary data indicating that the genus should be assigned to Bryozoa instead of a new subclass (Septodaearia) of the Anthozoa as supposed for Australian and Swedish specimens.
The present paper gives detailed documentation and descriptions concerning the morphology, structure and budding of such tube-like enigmatic fossil compared with both Anthozoa and Bryozoa. The result is that Septodaeum, without any doubt, is a trepostome bryozoan belonging to the genus Hallopora Bassler, 1911.
- Moncharmont-Zei M., Russo B., Sgarrella F., Bonaduce G. & Mascellaro P. (1984)
Paleoclimatic record from 4 cores (Gulf of Taranto, Ionian Sea)
Evidence from Foraminifera and Ostracoda
pp. 21-51
The ostracods and foraminifers from four cores collected from different bathyal environments in the Gulf of Taranto, Italy, were examined. Detailed study of the planktonic foraminifers indicated a succession of assemblages from warm to cold environments which documented the climatic evolution occurring in the sediments. The data, as mean percent ratios of planktonic foraminifers in a fixed volume, were utilized to construct paleoclimatic curves. Moreover, the presence and abundance of some benthic ostracod species, chased as paleoclimatic indicators by comparison to foraminiferal paleoclimatic curves, were used to examine the presence and quantitative distribution of ostracods within defined paleoclimatic ranges. From the presence and abundance of selected benthic ostracod species, paleoclimatic curves were also constructed. These curves and trends agreed with those of the planktonic foraminifers indicating a «cold» period associated with the end of the last glaciation and a « warm » period which as a whole corresponds to the Holocene. Benthic foraminifers and ostracods, always inferior in number to planktonic foraminifers, were represented by species characteristic to bathyal environments. Their abundance indicated a maximum during the Glacial period and a great reduction during the Holocene period.
- Raffi I. & Sprovieri R. (1984)
Calcareous plankton in the DSDP Hole 125 – Leg. 13 (Ionian Sea – Eastern Mediterranean): a review
pp. 53-73
A review of the calcareous nannoplankton and planktonic foraminifera of Hole 125 (DSDP Leg. 13) made it possible to recognize many biostratigraphic events which date the studied sequence as Upper Pliocene to Pleistocene. By correlation with the Vrica stratotype section for the N/Q boundary, the Plio/Pleistocene boundary has been recognized at the top of Core 4, where Gephyrocapsa oceanica s.l. and the first consistent left coiling specimens of Globigerina pachyderma appear; Globigerina cariacoensis first occurs at the base of Core 3. In the interval between Samples 4-3-99 cm and 4-2-105 cm, within the « Globorotalia inflata zone » and the « Discoaster brouweri subzone » (Uppermost Pliocene), many specimens of Globorotalia truncatulinoides are present. Globorotalia truncatulinoides excelsa appears in Sample 2 CC, where it is found in association with Globorotalia truncatulinoides. A major hiatus has been recognized between the top of Core 3 and the base Core 2, and corresponds at least to the Sicilian stage. A cold peak already recognized in Core 2 cannot be correlated with the base of the Glacial Pleistocene, since it is recorded a few centimeters below the FAD of Pseudoemiliania lacunosa, which has been dated at 0.46 MA. The absence of specimens of Emiliania huxleyi at the top of the sequence implies that the sediments deposited at least during the last 0.26-0.27
MA are missing in Hole 125.
- Calzada S. (1984)
Lower Hauterivian Brachiopoda from Fortuna, Murcia Prov., Spain, Subbetic
pp. 75-90
A Lower Hauterivian Brachiopod fauna coming from the neighbourhood of Fortuna (Murcia Prov., Spain, External Subbetic) is described. Its environment is envisaged as a deep one. It is of particular interest because this deep fauna is poorly known. As a consequence according to our
poor knowledge, among 9 species described, 5 are considered to be new species, including also 2 new genera. The distribution of several species and genera are enlarged both stratigraphically and geographically.
Concretely the following taxa are studied.
Among the Rhynchonellidae, a new genus, named Fortunella, is erected. Its characteristic features are smooth valves and falcifer crura. It can be thought as very useful in the explanation of the links between the smooth Basiliolidae and the costale Lacunosellinae. For the first time Fortunella ? undulata (Jacob & Fallot) is recorded from Spain.
Among the Terebratulacea are studied Nucleata cf. strombecki and Pygites diphyoides, often referred from the Subbetic. The presence of Capillithyris middlemissi n. sp. may be important as it may be the earliest known appearance of this genus.
Among the Cancellothyridacea the presence of Cruralina strambergensis Nekvasilova, which was hitherto regarded as having a restricted distribution in Central Europe, is significant.
The Terebratellacea are represented with 3 new species, belonging to 3 genera. Two of them, Dictyothyropsis and Zittelina, enlarge their stratigraphical range as far as Lower Hauterivian. The remaining, named Smirnovina, is thought to be a new one and shows a close relation to Tulipina (Cretaceous) and Zeuschneria (Upper Jurassic). It can be considered as an important key to explain the evolution of Dallinidae.
Generally, all these species have smooth valves, median foramen, dorsal umbones strongly convex, calcareous concretions and weak teeth.
They belong to the Alpine fauna (Owen, 1973) or to the Tethyan (Middlemiss, 1979).
- De Capoa Bonardi P. (1984)
Halobia zones in the pelagic Late Triassic sequences of the Central Mediterranean area (Greece, Yugoslavia, Southern Apennines, Sicily)
pp. 91-102
The study of forty three Late Triassic sections in pelagic facies measured in the Central Mediterranean area (Pindos basin, Greece; Budva-Kotor basin, Yugoslavia; Lagonegro basin, Southern Apennines; Imerese and Sicano basins, Sicily) allows the definition of nine Halobia range zones.
They are, from bottom to top: Halobia lenticularis zone (Tuvalian 2? – 3); H. styriaca zone (Lacian 1); H. mediterranea
zone (Lacian 2 – Alaunian 1); H. mojsisovicsi zone (Alaunian 1); H. rajkae zone (Alaunian 1 ); H. darwini zone (Alaunian 1 ); H. halorica zone (upper part of Alaunian 2); H. norica zone (upper part of Alaunian 2); H. distincta zone (top of Alaunian 2).
Their chronostratigraphy has been determined, when possible, by the associated conodonts.
- Stouge S. & Bagnoli Stouge G. (1984)
An Upper Llandovery conodont fauna from Eastern Hall Land, North Greenland
pp. 103-112
A conodont fauna of Early Silurian age (Llandovery) has been recorded from eastern Hall Land, North Greenland. The faunal association comprises Apsidognathus tuberculatus Walliser, Carniodus carnulus Walliser, Distomodus sp. and some species of Panderodus. The multielement apparatus of Ozarkodina hadra (Nicoll and Rexroad) is proposed here and a new species of Pterospathodus is described.
- Neri C. & Pasini M. (1984)
A mixed fauna at the Permian-Triassic boundary, Tesero Section, Western Dolomites (Italy)
pp. 113-117
Detailed paleontological research on the sequence at the Permian-Triassic boundary cropping out at Tesero (Western Dolomites) were carried out. A « mixed fauna», constituted by Permian-like Brachiopods, Ostracods, Foraminifers and Algae, and by Triassic-like Molluscs, here occurs in the lowermost beds of Werfen Formation.
- Diaz Estevez M.G., Benot Cadenas C. & Parra Rodriguez A. (1984)
Planktonic Foraminifera of Langhian-Serravalian age from the continental shelf of Cadiz Gulf (Spain)
pp. 119-124
Planktonic foraminiferal assemblages from cores of a borehole are studied. The drill site is located in the continental shelf of « Golfo de Cadiz » (SW Spain). The considered interval is from a depth of 2520 m to 2240 m. The recognized biostratigraphic units are as follows, from bottom to top: Globigerinoides sicanus Zone, Orbulina suturalis Zone, Globorotalia peripheroacuta Zone, Globorotalia praefohsi Zone, Globorotalia fohsi Zone, Sphaeroidinellopsis subdehiscens Zone, Globorotalia menardii Zone.
The distribution of planktonic Foraminifera is in agreement with the ranges given by Berggren and Amdurer (1973), spanning in age from Early Langhian to Late Serravallian.
- Ficcarelli G., Torre D. & Turner A. (1984)
First evidence for a species of raccoon dog, Nyctereutes Temminck, 1838, in South African Plio-Pleistocene deposits
pp. 125-130
Material from Plio-Pleistocene age deposits in South Africa, previously described as a species of extinct jackal, is here referred to the genus Nyctereutes. Although widely known from Eurasian deposits of this age, this is the first record of Nyctereutes in Africa. Today Nyctereutes is represented by a single species, N. procyonoides Gray, 1834, the raccoon dog, which occurs naturally in eastern Asia.
- Bonaduce G. & Sprovieri R. (1984)
The appearance of Cytheropteron testudo Sars (Crustacea: Ostracoda) is a Pliocene event. Evidences from a sicilian sequence (Italy)
pp. 131-136
It has been demonstrated that Cytheropteron testudo first appeared in the Plio-Pleistocene section of Mount S. Nicola (Sicily) earlier before the N/Q boundary as based on the foraminiferal content. Therefore this ostracode species cannot be accepted as a marker for the N/Q boundary as previously stated.
- Manni R. & Nicosia U. (1984)
Crataegocrinus toniellii n. gen. n. sp. from the Dogger of the Central Apennines
pp. 137-139
A new cyrtocrinid is described from the Dogger of the Central Apennines. It is named Crataegocrinus toniellii, and it is included in the suborder Cyrtocrinina Sieverts-Doreck, 1952, family incertae sedis. Scarcity of material, only three cups, prevents us to establish a new family.
Issue 2
Published in September 1985
- Cherchi A. & Schroeder R. (1984)
Intergrowth of the Early Cambrian algae Epiphyton Bornemann and Renalcis Vologdin from SW Sardinia
pp. 141-147
Early Cambrian archaeocyathid limestones from Seddas Moddizzis near Gonnesa (SW Sardinia) contain three intergrowing algal morphotypes which can be assigned to Epiphyton Bornemann, 1886, Renalcis Vologdin, 1932 and Chabakovia Vologdin, 1939. The latter two morphotypes are intergrading shapes of a single taxon which has to be named Renalcis. The always very sharp boundary between intergrowing Renalcis and Epiphyton indicates that the latter morphotype has to be considered as a separate genus. The theory of Pratt (1984) on the origin and the interpretation of Epiphyton and Renalcis is critically discussed.
- Cherchi A. & Schroeder R. (1984)
Middle Cambrian Foraminifera and other microfossils from SW Sardinia
pp. 149-160
A micropaleontological study of the Nodular Limestone Member of the Middle Cambrian Cabitza Formation near Iglesias (SW Sardinia) yielded the oldest foraminifera (Astrorhizidae, Psammosphaera, Hemisphaerammina, Ammodiscidae) known until now from Sardinia; they occur together with Girvanella, Chancelloriidae, hexactinellid sponge spicules and echinoderm plates. The presence of Hadimopanella Gedik, known from the Lower to Middle Cambrian of Turkey, the Siberian Platform and N Spain, is the first proof of this phosphatic microproblematicum in Sardinia.
- Pittau P. (1984)
Tremadocian (Early Ordovician) Acritarchs of the Arburese Unit, Southwest Sardinia (Italy)
pp. 161-204
Sixtysix species of acritarchs coming from few rich levels of the detritic Cambro – Ordovician sequence, « Postgotlandiano Auctorum », of southwestern Sardinia, have been studied. Of them, 46 species have been described and fiftyfour species have been illustrated. Two new genera, Monocrodium and Tariccrodium, and twenty new species have been erected.
The age of the studied sediments is Tremadocian, and the correlation is based on the acritarchs.
- Palmer D. & Gnoli M. (1984)
A preliminary report on new micropaleontological discoveries in the Silurian of Southwest Sardinia
pp. 205-209
Myodocopid ostracodes from Late Silurian beds of southwestern Sardinia, studied for the first time by Canavari in 1899, were recovered from the type-locality and adjacent areas to try a taxonomical and biostratigraphical revision of this group of fossils (Palmer & Siveter, in preparation). Associated faunas (conodonts, graptolites, cephalopods, trilobites and phyllocarids) furnished the stratigraphic control of the various sampled beds. Among various fossils the rhaphiophorid trilobite Ampyx sp. aff. roualti Barrande and the monograptid Saetograptus cf. fritschi Perner, both stratigraphically important, are reported for the first time from the Upper Silurian of southwestern Sardinia.
- Gnoli M. & Serpagli E. (1984)
An unusually preserved foraminiferal association from the Upper Silurian-Lower Devonian beds in southwestern Sardinia
pp. 211-220
A foraminiferal fauna, consisting of agglutinated forms and for the most part of secondarily phosphatized inner moulds, is described and illustrated for the first time from U. Silurian-L. Devonian beds of southwestern Sardinia.
- Gnoli M. (1984)
Paleontological content, constituent analysis and microbiofacies of Early Devonian pelagic limestones from the Fluminimaggiore area (SW Sardinia)
pp. 221-238
Paleontological content and sedimentological features of Lower Lochkovian-Upper Pragian pelagic limestones,
cropping out in two sections near the village of Fluminimaggiore (southwestern Sardinia), are studied in detail.
Among various fossils, 12 species of ostracodes, mostly belonging to Podocopida, are illustrated for the first time from Sardinia.
This ostracofauna could represent a benthic assemblage oj sublittoral-upper bathyal environment (« Eifeler Okotyp » versus « Thuringer Okotyp », Bandel & Becker, 1975).
On thin sections of 15 samples, from both sections, a modal quantitative analysis of main constituents and skeletal sand,
represented by 7 different taxa, is also included. Five main microfacies are distinguished on the basis of their fabrics, and genetical interpretation within the various lithotypes.
Paleontological and sedimentological data from this study would suggest deposition in a pelagic environment linked to a regressive evolution of submarine rises (« Schwellen facies ») inside a relatively deep epeiric sea. According to this hypothesis, the presence
of a wide cratonic area in the whole circum-Mediterranean area during Early Paleozoic would be further confirmed.
- Mastandrea A. (1984)
Early Devonian (Lochkovian) conodonts from southwestern Sardinia
pp. 240-258
Early Devonian conodonts are discussed and figured from nodular limestones outcrops near Fluminimaggiore in southwestern Sardinia.
By means of conodont study the occurrence of the Lochkovian age with the delta Zone has been confirmed in the Fluminese area.
The faunal association comprises diagnostic species as Ancyrodelloides kutscheri, Ancyrodelloides trigonicus, Ozarkodina transitans, Ozarkodina stygia, Ozarkodina steinhornensis telleri, Icriodus angustoides alcoleae and Ozarkodina fluminensis n. sp.
The species Ozarkodina fluminensis is described as new taxon and discussed as probable stratigraphical marker of the delta Zone in Sardinia.
A new apparatus (Apparatus A) is regarded as new but described with open nomenclature.
The species are described in terms of multielement taxonomy.
- Mastandrea A. (1984)
Biostratigraphic remarks on Early Devonian conodonts from Corti Baccas III section (SW Sardinia)
pp. 259-267
In this paper an Early Devonian conodont fauna obtained from limestones outcropping at the Corti Baccas near Fluminimaggiore (southwestern Sardinia) is illustrated.
The faunal association, rather poor, comprises among others Pelekysgnathus serratus n. ssp. A, Icriodus steinachensis morphotype ß, Pandorinellina steinhornensis miae, Eognathodus sulcatus kindlei and Polygnathus pireneae allowing the identification of the kindlei and pireneae Zones. Chronostratigraphically, part of the section has a Pragian age.
- Olivieri R. (1984)
Middle and Late Devonian conodonts from Southwestern Sardinia
pp. 269-310
Two nearby sequences represented by stratified limestone beds cropping out at Su Nuargi near Domusnovas (Iglesiente), have been investigated to define their age by means of conodonts. The taxonomic study of a well preserved conodont fauna and the examination of limestone litologies in thin sections, enabled the present author to prove the presence of Middle as well as Late Devonian pelagic sediments in outcrops previously attributed to Silurian. The Givetian Middle and Upper varcus Subzones, the Frasnian Ancyrognathus triangularis Zone, the Famennian Upper crepida, Lower and Upper rhomboidea, Upper marginifera Subzones were identified from these very condensed sequences. A total of 3255 specimens were collected. Among 79 species and subspecies, referred to 22 genera, Ancyrolepis cixerriensis is described as a new taxon.
- Bagnoli G., Perri M.C. & Gandin A. (1984)
Ladinian conodont apparatuses from northwestern Sardinia, Italy
pp. 311-323
A conodont fauna of Middle Triassic age (Fassanian) was recorded from Punta del Lavatoio and Contrada Renuzzo sections (Nurra, northwestern Sardinia, Italy).
The faunal association consists of « Epigondolella » truempyi (Hirsch, 1971), Neogondolelia longa Budurov & Stefanov, 1973, Algherella riegeli (Mosher, 1968) and Algherella uniformis (Mosher, 1968).
The species are described in terms of multielement taxonomy. The apparatuses of « Epigondolella » and Algherella n. gen. are proposed. « Epigondolella » has an apparatus composed of seven types of elements. Algherella has an apparatus characterized by the lateral bending of the anterior part of the elements.
According to Kovacs & Kozur (1980) and Budurov (1981) the presence of « Epigondolella » truempyi is indicative of the upper curionii Zone (Late Fassanian).
- Del Rio M. (1984)
Palynology of Middle Jurassic black organic shale of “Tacco di Laconi”, Central Sardinia, Italy
pp. 325-342
The black organic shale, belonging to the « Tacco di Laconi » have been palynologically investigated. The microflora, rich indeed, is similar to those known for the same formation in other partes of the Island and reflects the characters of the macroflora studied by Krasser (1920) and Edwards (1929) in the Laconi’s plant deposits. Palynostratigraphically this layer may be correlated with the Ischyosporites variegatus Zone of Iran-Afghanistan Basin, dated as Bajocian-Bathonian.
- Dieni I. (1984)
Lenticulina exgaleata, new name for Cristellaria galeata Terquem 1870, non Reuss 1851
pp. 343
- Colin J.P., Feist N., Grambast-Fessard M., Cherchi A. & Schroeder R. (1984)
Charophytes and ostracods from the Berriasian (Purbeckian facies) of Cala d’Inferno (Nurra region, NW Sardinia)
pp. 345-354
Charophytes and ostracods from the Berriasian (Purbeckian facies) of Cala d’Inferno (Nurra, NW Sardinia) are described. Some new taxa are erected: the charophyte Musacchiella sardiniae Feist & Grambast-Fessard n. sp., and the ostracods Cypridea dorsoinclinata Colin n. sp., C. tumescens meridionalis Colin n. subsp., Theriosynoecum sardum Colin n. sp.
- Cherchi A. & Schroeder R. (1984)
Sarfatiella sarda (Pecorini, 1972) n. comb. (Dasycladaceae) from the basal Lower Cretaceous of NW Sardinia and some comments on Lacrymorphus Radoičić and Humiella Sokač & Velić
pp. 355-360
Isolated calcitic bodies from the basal Lower Cretaceous of Punta Malrepos (Nurra, NW Sardinia) are described and interpreted as ampullae of Lacrymorphus catenaeformis sardus Pecorini, 1972. This taxon is attributed to the dasycladacean genus Sarfatiella Conrad & Peybernès, 1974. Some comments on the wall structure of Lacrymorphus Radoičić and Humiella Sokač & Velić, recently discussed by Masse et al. (1984), are made.
- Cherchi A. & Schroeder R. (1984)
Koskinobullina socialis Cherchi & Schroeder, 1979: a colonial microfossil incertae sedis (algae?) from Jurassic-Cretaceous of the mediterranean region
pp. 361-374
Well preserved material of Koskinobullina socialis Cherchi & Schroeder, 1979 form the Bathonian of NW Sardinia and the Middle Cenomanian of N Spain allows the detailed description of this micro-organism, which was regarded by previous authors as an alga, an acervulinid foraminifer or a problematic microfossil. Koskinobullina shows strong affinities to the problematic Paleozoic genus Wetheredella Wood, with which it is placed in the revised family Wetheredellidae Vachard. The interpretation of Koskinobullina as an acervulinid foraminifer is rejected; the systematic position of this genus is still unknown.
- Dieni I. & Radoičić R. (1984)
Emendation of genus Uteria Michelin, 1845 (Dasycladaceae)
pp. 375-379
The study of Paleocene representatives from eastern Sardinia and from Slovenia provided new elements for a more complete knowledge of Uteria structure (Dasycladaceae). An emendation of the genus is proposed.
- Schiavinotto F. (1984)
Different evolutionary stages in the Miogypsinidae from Sardinia
pp. 381-393
Biometric analysis of Miogypsina assemblages from two Marmilla outcrops (central-southern Sardinia), allows to emphasize that the two assemblages show a different evolutionary stages in the process of nepionic acceleration, referable to the species Miogypsina (Miogypsinoides) bantamensis Tan Sin Hok and M. (Miogypsina) intermedia Drooger, respectively.
These species appear clearly spaced, both phylogenetically and stratigraphically; their identification, together with others mentioned in literature, allows one to suppose in a preliminary way that in Sardinia the development of a large part of the major phyletic lineage of Mediterranean Miogypsinids took place.
The fragmentary record of the evolutionary development of the Sardinian Miogypsinidae could be in relationship, beside the scarcity of the available data, with spatially variable ecological conditions suitable for their settling, during the Sardinian Oligo-Miocene refting process. On the other hand, the absence of representatives of the end members of the Mediterranean Miogypsinidae lineage which are recorded in southern Spain, Morocco and Algeria, if confirmed, could be connected with a faunistic break consequent to the opening of the Balearic Basin in the Early Miocene.
The sample with M. (Miogypsinoides) bantamensis is referred to the lowest part of the N4 Zone of Blow (1969), while the planktonic foraminiferal content associated with M. (M.) intermedia (Globigerinoides altiaperturus–Catapsydrax dissimilis Subzone) seems to confirm, with a greater detail, the correlations already known in literature.
- Iaccarino S., d’Onofrio S. & Murru M. (1984)
Miocene foraminifera of several sections of the Marmilla area (central western Sardinia)
pp. 395-412
The micropaleontological study based on the planktonic and benthic foraminifera indicates that the sediments of the investigated sections are Burdigalian to Serravallian in age (Globigerinoides altiaperturus – Catapsydrax dissimilis Subzone to Orbulina universa Subzone). The benthic assemblage is indicative of lower epibathyal environment.
- Corradini D. (1984)
Dinoflagellate cysts from the Miocene of Sardinia (Italy)
pp. 413-420
Dinoflagellate cysts occur in Miocene sediments from Sardinia. Five sequences are examined and lists of dinocyst assemblages are given.
Biostratigraphic remarks tend to provide the basis for a cyst stratigraphy. The paleoecological significance of the dinoflagellate cyst assemblages is discussed with particular emphasis on the evolution of the oligo-miocenic sardinian rift.
- Bonaduce G. & Russo A. (1984)
The Miocene Ostracodes of Sardinia
pp. 421-437
Four sections sampled in Marmilla region (Central-Southern Sardinia) and one sampled on the Sinis promontory (Central-Western Sardinia) were analyzed for the studying the ostracode faunas. The Ostracodes of Marmilla region (Early-Middle Miocene) yelds a deep water assemblages, whereas the Ostracodes of Sinis (Late Tortonian-Early Messinian) indicate a very shallow environment with few evidences of brackish water episodes.
- Barbieri R. & D’Onofrio S. (1984)
Benthic Foraminifera of the Fangario Formation (Cagliari, Sardinia)
pp. 439-447
A rich benthic foraminiferal fauna from Middle Miocene of Sardinia has been described. The fossiliferous layers belong of the Fangario Formation which has the type area near Cagliari. 97 species are classified; 24 of them are discussed and figured. Some paleobathymetric conclusions are inferred.
Issue 3
Published in January 1986
- Montanari L., Rio D. & Sprovieri R. (1984)
Micropaleontologic study of the Licodia Eubea (Catania, Sicily) Lower Cretaceous section
pp. 451-471
A short section outcropping near Licodia Eubea (Catania, Sicily) was studied. 82 benthic foraminifera species and 13 calcareous nannoplankton species bave been classified and their range in the section is reported. Both benthic foraminifera and calcareous nannoplankton made it possible to independently recognize the uppermost Hauterivian. Also in Sicily, therefore, the studied benthic species display the same distribution recognized in the extramediterranean regions.
- Sarti C. (1984)
Ammonite fauna and biostratigraphy of the central Trentino region (Kimmeridgian-Tithonian), Northern Italy
pp. 473-514
The Rosso Ammonitico Veronese is a carbonate formation of the middle and upper Jurassic, very rich in ammonites.
The formation can be subdivided into 3 litostratigraphic units in continuous succession. This paper studies the ammonite fauna of the upper unit, found in the central Trentino region, and defines the biostratigraphy. This upper unit, which can be ascribed to Kimmeridgian (in the Southern European sense) and Tithonian p.p., is subdivided for the first time into 8 biozones which, starting at the base and moving upwards, are: Divisum zone, Acanthicum zone, interval zone n. 1, Beckeri zone, Hybonotum zone, Albertinum zone, Semiforme zone, interval zone n. 2. From a litostratigraphic point of view, the « cycles » described by Ogg (1981), usually incomplete due to the omission of the marly term, have been recognised. With regard to the study of ammonite fauna, 48 species have been recognised, including Virgatosphinctes sp., a new form in literature and not specifically defined since only one specimen was found. As well as the ammonites, specimens of aptychi, brachiopods, lamellibranchia, echinoids and belemnites were collected.
- Bonaduce G., Ruggieri G. & Russo A. (1984)
The genus Tenedocythere (Ostracoda, Podocopida) of the Mediterranean Miocene to Recent especially from Italy
pp. 515-543
The review of the ostracode genus Tenedocythere mostly from Italian outcrops from Miocene to Recent, resulted in the recognition of 11 new species and 1 subspecies which are described and illustrated. These are: Tenedocythere birestis n. sp., T. cataphracta n. sp., T. cordiformis n. sp., T. cruciata n. sp. , T. furcata n. sp., T. furcata gradata n. ssp., T. obsoleta n. sp., T. parallela n. sp., T. perplexa n. sp., T. scabriuscula n. sp., T. scalprata n. sp., T. subulata n. sp. Moreover, most of the previously known congeneric species are re-illustrated and comparatively discussed. On the basis of the known elements, it seems likely that the genus Tenedocythere colonized the Mediterranean during Miocene from the indo-pacific area and from there subsequently reached the Atlantic. After the radical destruction of the Mediterranean fauna at the end of Miocene ( « salinity crisis » ), this genus reentered into the Mediterranean from the Atlantic. A new species of Pokornyella, P. devians is described in the appendix.