Gulf of California section 4 "tidal channel" fauna (Pleistocene of Mexico)

Also known as Section 4 - Tidal channel shell bed type

Where: Sonora, Mexico (31.8° N, 114.1° W: paleocoordinates 31.8° N, 114.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Late/Upper Pleistocene (0.1 - 0.0 Ma)

• Pleistocene fluvial, eolian, and deltaic deposits exposed in sea cliffs, overlain by coquina bed (dated at 125,00 bp)

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; unlithified, burrowed sandstone

• active trans-tensional rift basin
• No grain size stated (assumed from stratigraphic features); med. to large scale cross bedding; burrowing on base of channel.

Size class: macrofossils

Preservation: mold/impression, original calcite

Collection methods: bulk,

• No comments on collection metholodolgy

Primary reference: K.H. Meldahl and A. H. Cutler. 1992. Neotectonics and taphonomy; Pleistocene molluscan shell accumulations in the northern Gulf of California. Palaios 7(2):187-197 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 34939: authorized by Austin Hendy, entered by Austin Hendy on 20.10.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Tivella byronensis
Less than 2% abundance
Cirripedia indet. barnacle
Listed as "Barnacle plates"; abundance not given due to poor preservation
Bivalvia indet. Linnaeus 1758 clam
Listed as "unidentifiable bivalves"
 Pectinida - Pectinoidae
Pectinidae indet. Wilkes 1810 scallop
Abundance not given due to poor preservation
 Pectinida - Anomiidae
"Anomia adamas" = Anomia (Anomia) peruviana
"Anomia adamas" = Anomia (Anomia) peruviana d'Orbigny 1846 jingle
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
Less than 2% abundance
 Cardiida - Veneridae
"Chione cortezi" = Chionista fluctifraga Sowerby 1853 venus clam
Less than 2% abundance
Chione californiensis Broderip and Sowerby I 1835 venus clam
"Dosinia ponderosa" = Dosinia (Dosinia) ponderosa Gray 1838 venus clam
Less than 2% abundance
Pitar sp. Römer 1857 venus clam
Less than 2% abundance
 Cardiida - Donacidae
Donax sp. Linnaeus 1758 clam
Less than 2% abundance
 Cardiida - Cardiidae
Trachycardium sp. Mörch 1853 cockle
Less than 2% abundance
Gastropoda indet. Cuvier 1797 snail
Listed as "unidentifiable gastropods"
 Neogastropoda - Olividae
Oliva sp. Bruguière 1789 olive snail
Less than 2% abundance
 Neogastropoda - Nassariidae
Nassarius sp. Duméril 1806 snail
Less than 2% abundance
 Neogastropoda - Melongenidae
Melongena patula Broderip and Sowerby 1829 snail
Less than 2% abundance
 Sorbeoconcha - Potamididae
Cerithidea sp. Swainson 1840 horn snail
Less than 2% abundance
 Sorbeoconcha - Turritellidae
Turritella sp. Lamarck 1799 turret shell
Less than 2% abundance
 Sorbeoconcha - Cerithiidae
Cerithium sp. Bruguière 1789 cerith snail
 Clypeasteroida - Mellitidae
Encope sp. Agassiz 1840 sand dollar
Less than 2% abundance