80 University of California Publications in Geology [Vou.7 
the lakes in central eastern Tierra del Fuego, lat. 53°S, where they are 
said to breed, and certainly spend a part of the season. This region cor- 
responds in temperature to the climate of central Alberta, Canada, 400 
miles north of Silver Lake. Thus it appears that the presence of Phoenicop- 
terus copei at Silver Lake has very little weight in the determination of 
climate. It is more probable that the northern lakes of that period con- 
tained mollusks on which the flamingoes fed.’’ 
Aside from an extinct genus of grouse, Phoenicopterus is the 
only genus recorded fossil that might not reasonably be expected 
to oceur in the region at the present time. 
Shufeldt’s original paper’? gives a detailed description of 
most of the species of birds found in the Fossil Lake beds and 
a synoptical list of the known species was published in a paper 
by the writer’® as follows: 
£chmophorus occidentalis (Lawrence). 
Pygopodes: Echmophorus occidentalis (Lawrence). 
Colymbus holboelli (Reinhardt). 
Colymbus auritus Linneus. 
Colymbus nigricollis californicus (Heermann). 
Podilymbus podiceps (Linneus). 
Longipennes: Larus argentatus Pontoppidan, 
Larus robustus Shufeldt. 
Larus californicus Lawrence. 
Larus oregonus Shufeldt. 
Larus philadelphia (Ord). 
Xema sabini (J. Sabine). 
Sterna elegans Gambel. 
Sterna forsteri Nuttall. 
Hydrochelidon nigra surinamensis (Gmelin). 
Steganopodes: Phalacrocorax macropus (Cope). 
Peleeanus erythrorhynchos Gmelin. 
Anseres: Lophodytes cucullatus (Linnaeus). 
Anas platyrhynchos Linnaeus. 
Mareea americana (Gmelin). 
Nettion carolinense (Gmelin). 
Querquedula discors (Linnaeus). 
Querquedula eyanoptera (Vieillot). 
Spatula clypeata (Linnaeus). 
Dafila acuta (Linnaeus). 
Aix sponsa (Linnaeus). 
15 Shufeldt, R. W., Journ. Acad. Nat. Sci. Phila., ser. 2, no. 9, pp. 389- 
45, 1892. 
16 Miller, L. H., Univ. Calif. Publ., Bull. Dept. Geol., vol. 6, pp. 79-87, 
1911. 
