Mad River, sandflat facies [Hookton Fm] (Pleistocene of the United States)

Where: Humboldt County, California (41.0° N, 124.1° W: paleocoordinates 41.0° N, 124.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From the Hookton Fm (or Falor Fm equivalent), which overlies the Carlotta Fm of the Wildcat Gp. AGE: Middle-Late Pleistocene according to text. STRATIGRAPHIC POSITION:

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified sandstone

• Backbar, slough-margin sandflat deposit
• SPECIFIC LITHOLOGY: Sand. LITHIFICATION: Poorly lithified, on the basis of sample preparation.

Size class: macrofossils

Collected by Miller III

Collection methods: bulk, chemical, sieve,

• COLLECTOR: W. Miller III. PREPARATION: sample was soaked in 10% sodium hexametaphosphate solution and washed on a screen with 2-mm openings. All fossils separated from matrix were sorted, identified to species if possible,

•counted, and examined for epi- and endobionts.

Primary reference: W. P. Miller III and S. D. Morrison. 1988. Marginal marine Pleistocene fossils from near mouth of Mad River, northern California. Proceedings of the California Academy of Sciences 45(10):255-266 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 96900: authorized by Austin Hendy, entered by Austin Hendy on 11.07.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs, and other invertebrates. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature, and species-resolution identifications.
Thecostraca
 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle
Malacostraca
 Decapoda -
Brachyura indet. Latreille 1802 crab
Sedentaria
 Spionida - Spionidae
Polydora indet. Bosk 1801
Polyplacophora
 Neoloricata - Mopaliidae
Mopalia sp. Gray 1847 chiton
Gastropoda
 Heterostropha - Pyramidellidae
 Opisthobranchia - Cylichnidae
Cylichnella culcitella snail
SUBSPECIES: Cylichnella culcitella eximia
Bivalvia
 Cardiida - Lasaeidae
"Mysella tumida" = Kurtiella tumida
"Mysella tumida" = Kurtiella tumida Carpenter 1864 kelly clam
 Cardiida - Tellinidae
Macoma nasuta Conrad 1837 tellin clam
 Cardiida - Cardiidae
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii
"Clinocardium nuttallii" = Clinocardium (Clinocardium) nuttallii Conrad 1837 cockle
 Cardiida - Mactridae
Tresus sp. Gray 1853 clam
 Cardiida - Veneridae
"Protothaca staminea" = Leukoma staminea, Nutricola sp.
"Protothaca staminea" = Leukoma staminea Conrad 1837 venus clam
Nutricola sp. Bernard 1982 venus clam
 Pholadida - Myidae
Cryptomya californica Conrad 1837 softshell clam
 Ostreida - Ostreidae
Ostrea lurida Carpenter 1864 oyster
 Mytilida - Mytilidae
Mytilus edulis Linnaeus 1758 mussel
Demospongiae
 Clavulina - Clionaidae
Cliona sp. demosponge