70 University of California Publications in Geology [Vou.7 
neys seems a very probable method. These open chimneys may 
have acted as pitfalls into which animals blundered in passing 
over the surface. Again, predatory forms may have earried 
their prey into the mouths of the caverns whence the accumulated 
bones were washed, or carried by woodrats, into the more remote 
This last method seems to the present author the 
most probable means of introduction of such forms as the 
recesses. 
anserines among birds. Falco peregrinus, whose remains also 
occur in the deposits, is a large and powerful hawk which 
habitually resorted to such places to nest. About the entrances 
to their nesting crevices today one commonly finds the ac- 
cumulated bones of a great variety of vertebrates brought as 
prey. Their predilection for the anserines has given these birds 
their common name of duck hawk. 
Sinclair records the following list of vertebrates from the 
Potter Creek Cave deposits, marking extinct species with an 
asterisk : 
Sryciair’s List oF SPECIES FROM POTTER CREEK CAVE 
*Aretotherium simum Cope. 
*Ursus, n. sp. 
*Felis, n. sp. 
Felis, near hippolestes Merriam, 
Cc. H. 
Lynx fasciatus Rafinesque. 
Lynx fasciatus, n. subsp. (?) 
Uroeyon townsendi Merriam, C. H. 
Vulpes cascadensis Merriam, C. H. 
*Canis indianensis Leidy. 
*Taxidea, n. sp. 
Bassariscus raptor Baird. 
Mephitis occidentalis Baird. 
*Spilogale, n. sp. 
Putorius arizonensis Mearns. 
Arctomys, sp. 
Sciurus hudsonicus albolimbatus 
Allen. 
Sciuropterus klamathensis Mer- 
riam, C. H. 
Spermophilus douglasi Richard- 
son. 
Eutamias senex (?) Allen. 
* Species marked with the asterisk 
longer represented in the region. 
Callospermophilus chrysodeirus 
Merriam, C. H. 
Lepus californicus Gray. 
Lepus klamathensis Merriam, C. 
H. 
Lepus, near auduboni Baird. 
Lepus, sp. 
*Teonoma, n. sp. 
Neotoma fuscipes Baird. 
Microtus californicus Peale. 
*Thomomys, n. sp. 
Thomomys leucodon Merriam, C. 
H. 
Thomomys monticola Allen 
*Aplodontia major, n. subsp. 
Scapanus ecalifornicus (?) Ayres. 
Antrozous pallidus Merriam, C. H. 
*Platygonus (?) sp. 
Odocoileus, Sp. a. 
Odocoileus, sp. b. 
Haplocerus montanus Ord. 
*Euceratherium collinum Sinclair 
and Furlong. 
(*) are either extinet or are no 
