USGS 9219 - Brasso Clay (Miocene of Trinidad and Tobago)

Where: Trinidad and Tobago (10.5° N, 61.2° W: paleocoordinates 10.2° N, 58.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Brasso Clay Formation, Middle Miocene (16.0 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From Brasso Clay. THICKNESS: Unknown AGE: Stated to be "Middle or Lower Miocene" in text, but potentially could be younger in more recent revisions; a Middle Miocene age is assigned here. STRATIGRAPHIC POSITION: Unknown.

• bed-level stratigraphic resolution

Environment/lithology: marine; unlithified claystone

• SPECIFIC LITHOLOGY: Clay. LITHIFICATION: Assumed to be unlithified based figured specimes (free of sediment).

Size class: macrofossils

Collected by Penny, Bullbrook; reposited in the USNM

• COLLECTORS: F. W. Penny and J. A. Bullbrook (unknown date, but presumably during the 1910's-early 1920's). REPOSITORY: USNM.

Primary reference: W. C. Mansfield. 1925. Miocene gastropods and scaphopods from Trinidad, British West Indies. Proceedings of the United States National Museum 66(22):9116-9125 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 74922: authorized by Austin Hendy, entered by Austin Hendy on 05.09.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and scaphopoda. Bivalvia not listed, but presumably present. NOMENCLATURE: Authoritative publication with subgenus and species assignments, but with antiquated nomenclature reflecting present usage.
Show authors, comments, and common names
Gymnolaemata
 Cheilostomata - Microporidae
Cupularia umbellata
Gastropoda
 Cerithioidea - Turritellidae
Turritella altilirata
Turritella altilirata Grzybowski 1899 turret shell
SUBSPECIES: T. altilirata chiriquensis
 Cerithioidea - Modulidae
Modulus tamanensis
Modulus tamanensis Maury 1925 snail
 Sorbeoconcha - Naticidae
"Natica canrena" = Naticarius canrena
"Natica canrena" = Naticarius canrena Linnaeus 1758 moon snail
 Neogastropoda - Buccinidae
Phos bulbrooki n. sp., Phos trinitatensis n. sp.
Phos bulbrooki n. sp. true whelk
Phos trinitatensis n. sp. Mansfield 1925 true whelk
 Neogastropoda - Cancellariidae
"Cancellaria bulbrooki n. sp." = Narona bulbrooki
"Cancellaria bulbrooki n. sp." = Narona bulbrooki Mansfield 1925 snail
 Neogastropoda - Mitridae
Mitra sp.
Mitra sp. Lamarck 1798 mitre shell
poorly preserved
 Neogastropoda - Drilliidae
Drillia popefusiformis n. sp., "Drillia consors" = Hindsiclava consors
"Drillia consors" = Hindsiclava consors Sowerby 1850 snail
SUBSEPCIES: D. consors bulbrooki
 Neogastropoda - Conidae
Conus trinitatensis n. sp., "Conus multiliratus" = Conasprelloides multiliratus
Conus trinitatensis n. sp. Mansfield 1925 cone shell
"Conus multiliratus" = Conasprelloides multiliratus Olsson 1922 cone shell
SUBSPECIES: C. multiliratus walli n. subsp.
 Neogastropoda - Turridae
"Turris vaningeni" = Gemmula vaningeni
"Turris vaningeni" = Gemmula vaningeni Brown and Pilsbry 1913 turrid
SUBSPECIES: T. vaningeni machapoorensis
 Neogastropoda - Olividae
Ancilla brassica
Ancilla brassica Maury 1925 olive snail
 Neogastropoda - Marginellidae
Marginella guaica
Marginella guaica Maury 1925 margin shell
 Neogastropoda - Muricidae
Typhis sp., "Typhis sawkinsi n. sp." = Siphonochelus (Laevityphis) sawkinsi
Typhis sp. Montfort 1810 murex snail
poorly preserved
"Typhis sawkinsi n. sp." = Siphonochelus (Laevityphis) sawkinsi Mansfield 1925 murex snail
 Sorbeoconcha - Strombidae
Strombus sp.
Strombus sp. Linnaeus 1758 conch
frag; poorly preserved
 Sorbeoconcha - Ranellidae
Cymatiella vokesorum
Cymatiella vokesorum Beu 2010 triton shell