Gulf of California section 2 "unconformity (lower)" fauna (Pleistocene of Mexico)

Also known as Section 2 - unconformity (lower) shell bed type

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

• coordinate estimated from map

• local area-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)

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; unlithified, burrowed, bioturbated, fine-grained, medium sandstone and siltstone

• active trans-tensional rift basin
• massive fine- to medium-grained sands; bedding almost obscured by bioturbation; bedding mostly planar or low-angle corss-stratified, rare wavy beds and reactivation cross-beds; Ophiomorpha and Thalassinoides burrows common; burrows backfilled with shelly debris; Skolithos rare to common

Size class: macrofossils

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 34934: authorized by Austin Hendy, entered by Austin Hendy on 20.10.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Tivella byronensis
Echinoidea
 Clypeasteroida - Mellitidae
Encope sp.
Encope sp. Agassiz 1840 sand dollar
Cirripedia
  -
Cirripedia indet.
Bivalvia
 Mytilida - Mytilidae
Modiolus capax
Modiolus capax Conrad 1837 mussel
 Cardiida - Veneridae
Pitar sp., Chione californiensis, "Chione gnidia" = Chionopsis gnidia
Pitar sp. Römer 1857 venus clam
Chione californiensis Broderip and Sowerby I 1835 venus clam
"Chione gnidia" = Chionopsis gnidia Broderip and Sowerby I 1829 venus clam
 Cardiida - Cardiidae
Trachycardium sp.
Trachycardium sp. Mörch 1853 cockle
 Cardiida - Tellinidae
Tellina sp., "Macoma indentata" = Macoma (Rexithaerus) indentata
Tellina sp. Linnaeus 1758 tellin clam
"Macoma indentata" = Macoma (Rexithaerus) indentata Carpenter 1864 tellin clam
Gastropoda
 Cerithioidea - Turritellidae
Turritella sp.
Turritella sp. Lamarck 1799 turret shell
 Sorbeoconcha - Naticidae
"Polinices recluzianus" = Glossaulax reclusiana
"Polinices recluzianus" = Glossaulax reclusiana Deshayes 1839 moon snail
 Neogastropoda - Olividae
Oliva sp.
Oliva sp. Bruguière 1789 olive snail