Geographic location: Contra Costa County, California

Stratigraphic unit: unknown

Section code: MDiab

Level in section: 4

Comments:

• "same horizon" as Site 2

• dated at 5.3 +/- 0.1 Ma: Tedford et al. 1987, who place the fauna above the Mulholland Fm. but do not discuss their correlation; the stratigraphic position of the Pinole Tuff was clearly unknown to Stirton and is not mentioned by Creely et al. 1982, but Tedford et al. 1987 indicate that the tuff between the Green Valley and Tassajara Fms. is unambiguously correlated with the Pinole Tuff on geochemical grounds

• some "Pinole Tuff" records may not pertain to this site

• this forms most of the Pinole Tuff list of Merriam 1917, which also includes a rhino and a proboscidean

Species	Old identification	Reference		Comments
Hypolagus edensis		White 1988		from "Pinole Tuff"; "Leporidae" is listed by Stirton
Peromyscus pliocenicus		May 1981		"Pinole"
Megalonyx sp.		Hirschfeld and Webb 1968		"Megalonychidae"
Borophagus sp.		Wang et al. 1999		indeterminate and listed under B. parvus on basis of geographic location only; "? Osteoborus sp."
Cernictis hesperus type
Plesiogulo lindsayi		Harrison 1981		"Pinole Tuff"
Machairodus sp.		Tedford et al. 1987		"Pinole Tuff"
Dinohippus sp.	Pliohippus cf. interpolatus
Neohipparion eurystyle		Tedford et al. 1987		"Pinole Tuff"
Camelidae indet.
? Sphenophalos sp.