USGS Cenozoic M902 Reliz Canyon (Miocene of the United States)

Where: Monterey County, California (36.3° N, 121.3° W: paleocoordinates 35.5° N, 116.9° W)

• coordinate stated in text

When: Pancho Rico Formation, Miocene (23.0 - 5.3 Ma)

• Described in reference as Pliocene. Pancho Rico Formation is Miocene per Addicott 1978 (Geological Survey Bulletin, Issue 1457).

Environment/lithology: marine; lithology not reported

• The molluscan fauna of the Pancho Rico Formation consists of taxa whose living representatives or modern analogs are usually found in the shallow nearshore areas of the northeastern Pacific Ocean. Many of the still living species are known to range into water deeper than 10-15 fathoms, but exclusively moderate-depth

•taxa are found only in collections from USGS localities M902 and M981 in Reliz Canyon. These localities are near the northwestern end of the outcrop area of the

•Pancho Rico and have an unusual faunal composition with respect to assemblages frmn the type area on Pancho Rico Creek and elsewhere on the east side of Salinas Valley. Water depths of 30 fathoms or more are suggested by the presence of Tu,rcica sp. and abundant Terebratalia arnoldi Hertlein and Grant.

Size class: macrofossils

Collected by D. L Durham in 1960

Primary reference: D. L. Durham and W. O. Addicott. 1965. Pancho Rico Formation, Salinas Valley. United States Geological Survey Professional Paper 524(A):A1-A22 [P. Holroyd/S. Tremblay]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 195081: authorized by Patricia Holroyd, entered by Susan Tremblay on 17.07.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Maxillopoda
 Sessilia - Balanidae
Rhynchonellata
 Terebratulida - Terebrataliidae
Lingulata
 Lingulida - Disciniidae
Discinisca sp. Gray 1840
Bivalvia
 Arcida - Arcidae
"Anadara trilineata" = Anadara (Anadara) trilineata
"Anadara trilineata" = Anadara (Anadara) trilineata Conrad 1856 ark
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Pectinida - Pectinoidae
Chlamys cf. hodgei Hertlein 1925 scallop
 Ostreida - Ostreidae
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii
"Ostrea atwoodi" = Ostrea (Ostrea) atwoodii Gabb 1866 oyster
 Cardiida - Veneridae
"Protothaca sp." = Leukoma
"Protothaca sp." = Leukoma Römer 1857 venus clam
 Cardiida - Tellinidae
Macoma sp. Leach 1819 tellin clam
 Lucinida - Lucinidae
Gastropoda
 Neogastropoda - Nassariidae
Nassarius sp. Duméril 1806 snail
 Neogastropoda - Cancellariidae
? Cancellaria sp. Lamarck 1799 snail
 Neogastropoda - Muricidae
Ocenebra sp. Leach in Gray 1847 murex snail
 Calyptraeoidea - Calyptraeidae
Calyptraea filosa Gabb 1866 slipper shell
Crepidula "n. sp. aff. aculeata" Lamarck 1799 slipper shell
 Sorbeoconcha - Turritellidae
Turritella "n. sp." Lamarck 1799 turret shell
 Seguenzioidea - Turcicidae
Turcica cf. caffea snail
brewis
 Fissurelloidea - Fissurellidae