Conus
californianus (Conrad, 1856)
Conrad's description of this species was from a
specimen found at Grapevine Canyon by W. P. Blake; his figure is defective, and
his description incomplete, but still the species can be recognized among the forms
obtained at the type locality. Gabb's criticism of the specific name employed
by Conrad is not well founded, since he misquoted it, (as Volutilithes
californica); as Conrad wrote it it seems to be entirely permissible.
Furthermore the specimen figured and described by Gabb for Conrad's species was
from Cochran's, east of Mount Diablo, and represents a distinct form, related
to, but not identical with Conrad's type. The names are, therefore, not
synonymous, and both may be used for their respective species. A small form,
quite similar to Gabb's species, occurs in the Tejon Group at the type
locality, but it is easily distinguishable from Conrad's; it may be identical
with C. remondi Gabb. It is still, doubtful whether this species should
be included in the list of valid species from the Type Tejon locality (1).
Dickerson recognized the distinctness of Gabb's
species, as well as the validity of the name used by Conrad, since he has
listed both from this locality (1).
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Conus
californianus (1)
Plate 8, fig. 5 mm. |
mm. 17 middle Eocene Tejon Formation Southern California |
mm. 36 late middle Eocene Cowlitz Formation Southwestern Washington |
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In similar appearance, Conus californicus
differs from Conus cowlitzensis for the more spaced grooves at the
base. |
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Bibliografia Consultata
·
(1)
- Anderson & Hanna (1925) “Fauna and Stratigraphics Relation of the Tejon
Eocene at the Type Locality in Kern County, California”
·
(2)
- CHECK LIST of the INVERTEBRATE FOSSILS OF NORTH AMERICA. EOCENE AND OLIGOCENE.
BY T. A. CONRAD.