Near Lomita - upper beds [Lomita Marl] (Pleistocene of the United States)

Where: California (33.8° N, 118.3° W: paleocoordinates 33.8° N, 118.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lomita Marl Formation, Middle Pleistocene (0.8 - 0.1 Ma)

• LITHOSTRATIGRAPHY: From the Lomita Marl, which is locally overlain by the Timms Point Silt and San Pedro Sand. AGE: Early Pleistocene in Woodring et al. (1946) and Valentine PhD, but is now regarded as Middle Pleistocene [A. Hendy]. STRATIGRAPHIC POSITION: From upper beds of the Lomita Marl.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; unlithified, sandy, calcareous marl

• ENVIRONMENT: Typically containing and offshore fauna.
• SPECIFIC LITHOLOGY: Not listed, but generally a calcareous sandy marl. LITHIFICATION: Not stated, but typically unlithified to slightly poorly-lithified.

Size classes: macrofossils, mesofossils

Preservation: original aragonite, original calcite

Collection methods: surface (float), surface (in situ)

• COLLECTOR: Unknown collector or date, but presumably c. 1920s. REPOSITORY: Unknown, but possibly CAS.

Primary reference: G. D. Hanna. 1923. Results of Preliminary Examination of Seven Samples of Sediments from near Lomita. Bulletin of the Southern California Academy of Sciences 22(2):64-68 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 203106: authorized by Austin Hendy, entered by Austin Hendy on 26.07.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Original identifications by G.D. Hanna, but quite antiquated; updated by Valentine (1950s).
Gastropoda
 Trochoidea - Trochidae
Bivalvia
 Cardiida - Veneridae
Saxidomus nuttalli Conrad 1837 venus clam
 Pholadida - Teredinidae
Teredo sp. Linnaeus 1758 clam
 Lucinida - Lucinidae
Epilucina californica Conrad 1837 clam
 Pectinida - Pectinoidae
"Hinnites giganteus" = Crassadoma gigantea
"Hinnites giganteus" = Crassadoma gigantea Gray 1825 scallop
Gastropoda
 Trochoidea - Turbinidae
"Pachypoma gibberosum" = Pomaulax gibberosa, "Pomaulax undosus" = Megastraea undosa
"Pachypoma gibberosum" = Pomaulax gibberosa Dillwyn 1817 red turban
"Pomaulax undosus" = Megastraea undosa Wood 1828 snail
 Neogastropoda - Olividae
"Olivella biplicata" = Callianax biplicata
"Olivella biplicata" = Callianax biplicata Sowerby 1825 olive snail