Estacao Agronomica - Bed 8 (Estacao Lmst.): Early/Lower Miocene, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gymnolaemata - Cheilostomata - Lunulitidae
Lunulites pileolus
Gastropoda - Neogastropoda - Turridae
Turris albida (Perry 1811)
    = Pleurotoma barretti Guppy 1866
Hendy et al. 2008
recombined as Polystira barretti
Gastropoda - Neogastropoda - Conidae
Conus longesperatus n. sp.
Close ally of: C. tortuosostriatus; complete specimen
Gastropoda - Turritellidae
Turritella agronomica
Turritella callizona
Bivalvia - Cardiida - Veneridae
Clementia brasiliana n. sp. Maury 1925
synonym of Clementia (Clementia) dariena
Callocardia sp. Adams 1864
Bivalvia - Cardiida - Cardiidae
Cardium (Trachycardium) coutinhoi n. sp.
original and current combination Trachycardium
Resembles: C. paraense
Bivalvia - Cardiida - Solecurtidae
Psammosolen cereris Maury 1924
recombined as Solecurtus cereris
Bivalvia - Cardiida - Tellinidae
Tellina penthesileae
Macoma cf. riopirabica Maury 1924
recombined as Macoma (Psammacoma) riopirabica
Bivalvia - Arcida - Arcidae
Scapharca ? melloi Maury 1924
recombined as Scapharca (Cunearca) melloi
Bivalvia - Pectinida - Plicatulidae
Plicatula eroessa
see common names

Geography
Country:Brazil State/province:Para
Coordinates: 1.0° South, 48.0° West (view map)
Paleocoordinates:1.0° South, 43.9° West
Basis of coordinate:based on nearby landmark
Altitude:1 meters
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Formation:Pirabas Member:Estacao Limestone
Stratigraphic resolution:bed
Stratigraphy comments: Collection from "bed 8" within the limestone unit. No description of the section is given so this collection cannot be placed in a stratigraphic framework. Fauna not very much like that of the Rio Pirabas outcrop, although many species are in common. Molluscan fauna indicate a Lower Miocene age. The deposit is stratigraphically near to the Pirabas Formation, but paleontological evidence is insufficient for an exact correlation. Maury (1924) suggested that it could be synchronous, slightly younger or slightly older. No specimens of Orthaulax have been ound in the fauna, suggesting a younger age, perhaps equivalent to the Gatun Fm. Simone (1994) does not illustrate any other Miocene units in the Parnaiba Basin other than the Pirabas Formation, for which I conclude the Estacao Limestone must now be considered a member of. The Pirabas Fm has a latest Late Oligocene to Middle Miocene age according text. Early Miocene in Vokes (1990), and is accordingly assigned to Early Miocene here.
Lithology and environment
Primary lithology:fine,shelly/skeletal,gray lithified calcareous "limestone"
Includes fossils?Y
Lithology description: Fine-grained, light gray limestone. Otherwise fine-grained, generally grayish limestone, composed of finely ground sediments, including imperfectly preserved molluscan shells and bryozoan colonies. The limestone is highly calcareous.
Environment:carbonate indet.
Geology comments: No environmental data reported.
Taphonomy
Modes of preservation:body,cast,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Collection method comments: Artificial casts of the external molds were made. Collected by F. de Carvalho and Dr. Gonzaga for G. de Campos of the Brazil Geological Survey. Types are reposited at the Museum of the Brazil Geological Survey.
Taxonomic list comments:Fairly lengthy list, but possibly not exhaustive given the quality of the fauna. The nomenclature is antiquated, though has species-resolution assignments; identifications by Maury who had extensive knowledge of circum-Caribbean faunas.
Metadata
Database number:60984
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2006-05-28 21:52:23 Last modified:2013-11-25 13:37:23
Access level:the public Released:2006-05-28 21:52:23
Creative Commons license:CC BY
Reference information

Primary reference:
17560. C. J. Maury. 1924. Fosseis Terciarios Do Brazil. Servico Geologico E Mineralogico Do Brazil Monographia 49 [A. Miller/A. Hendy/P. Wagner]

Secondary references:

19909 A. J. W. Hendy, D. P. Buick, K. V. Bulinski, C. A. Ferguson, and A. I. Miller. 2008. Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions. [A. Hendy/A. Hendy/A. Hendy]