UW 1075 - Martinez is a fossil collection site in Contra Costa, California, cataloged in the Paleobiology Database. Fossils here come from the Martinez Formation, dated to the Thanetian (59.24–56 million years ago). The depositional environment is recorded as offshore. Documented finds include Brachidontes (Brachidontes) cowlitzensis, Acila (Truncacila) decisa, Meretrix stantoni, Pitar quadratus, Pholadomya (Pholadomya) nasuta, Nuculana (Saccella) alaeformis.

Geologic setting

Formation: Martinez
Geologic interval: Thanetian
Age: 59.24–56 Ma
Depositional environment: offshore
Recorded occurrences: 21

Geology notes

No environmental information reported, but fauna appears to be offshore shelf.

Locality notes

0.2 miles due north of 218 ft hill east of Martinez, Carquinez quadrangle, Contra Costa County, California. Lat/long estimate based on hill 215 (potentially the 218 ft hill).

Fossils found here

Brachidontes (Brachidontes) cowlitzensis

Bivalvia · Mytilidae

Acila (Truncacila) decisa

Bivalvia · Nuculidae

Meretrix stantoni

Bivalvia · Veneridae

Pitar quadratus

Bivalvia · Veneridae

Pholadomya (Pholadomya) nasuta

Bivalvia · Pholadomyidae

Nuculana (Saccella) alaeformis

Bivalvia · Nuculanidae

Solena (Eosolen) stantoni

Bivalvia · Solenidae

Tellina (Eurytellina) martinezensis

Bivalvia · Tellinidae

Actaeon lawsoni

Gastropoda · Acteonidae

Architectonica tuberculata

Gastropoda · Architectonicidae

Brachysphingus sinuatus

Gastropoda · Buccinidae

Tritonium pulchrum

Gastropoda · Ranellidae

Polinices hornii

Gastropoda · Naticidae

Pseudoperissolax tricarnatus

Gastropoda · Muricidae

Priscoficus robustus

Gastropoda · Ficidae

Scaphander (Mirascapha) costatus

Gastropoda · Cylichnidae

Xenophora zitteli

Gastropoda · Xenophoridae

Turritella infragranulata pachecoensis

Gastropoda · Turritellidae

Siphonalia lineata

Gastropoda · Buccinidae

Surculites mathewsonii

Gastropoda · Turridae

Fusus aequilateralis

Gastropoda · Nassariidae

Records and references

Data: Paleobiology Database collection 52613 (CC BY 4.0) — view the source record

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Questions about UW 1075 - Martinez

Can you collect at UW 1075 - Martinez?

It depends on who owns the land and whether a mining claim covers it. BLM land usually allows hand collecting for personal use, national parks allow none, and private land needs the owner’s permission. Pro members see the owner and any claims at this spot.

What minerals are found at UW 1075 - Martinez?

Fossil.

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What to bring

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Meteorite nearbyA 314 g stony meteorite fell at Novato in 2012, 29 miles from here.

Source: Paleobiology Database.