61 1 PROCEEDINGS OF Til 10 WASHINGTON MEETING 



It is not improbable that the Willamette mylodon, Mbrotherium gigas, and the 

 Tomalea Bay form are all of the same genus, possibly of the same species. Possibly 

 they are all Afylodon, but since the humerus is not well preserved in Morotla rinm, 

 and the femur, on which that genus was based, is absent in the other two speci- 

 mens, it is not possible at the present time to determine their relationships satis- 

 factorily. 



Though it is not fully apparent to the writer that the genus Aforotherium, as de- 

 fined by Marsh, stands on a perfectly firm foundation, that name will be applied 

 to the Tomales Bay specimen until further evidence can be obtained. 



The second acquisition consists of fragments of humeri from near Martinez, 

 Contra Costa country. They include a distal end, possibly also the proximal end, 

 of a right humerus, presented to the University of California by Judge Jones, of 

 Martinez. These fragments were obtained by him some years ago from a loose, 

 horizontally stratified deposit along the shore of Suisun bay, east of the town. 

 Associated with them were bones and teeth of elephas and of a large species of 

 Equus. The fragment representing the distal end of the humerus shows the artic- 

 ular surfaces, the outer condyle, and the supinator ridge perfectly, but the inner 

 condyle is missing. It very closely resembles the specimen from Tomales bay, 

 but is possibly from a somewhat larger animal, in which the lower end of the 

 deltoid ridge was a little less prominent than in that form. 



Several miles west of Martinez, along the shore of San Pablo bay, there are 

 numerous occurrences of a deposit similar to that east of the town. In these beds 

 there have been found remains of elephas and bison (?>, along with a marine fauna, 

 consisting of recent species, so that there can be no doubt as to the Quaternary 

 age of the deposit. The beds at Tomales bay evidently belong to the same epoch 

 as those of San Pablo and Suisun bays. It is probable that the other mylodon-like 

 remains from this coast, including the footprints at Carson, Nevada, also belong- 

 to the Quaternary. 



CLASSIFICATION OF THE JOHN DA Y BEDS 

 BY JOHN C. MERRIAM 



An abstract is published in Science, February 9, 1900, volume xi, 

 page 219. 



NOTES CONCERNING EROSION FOR3IS AND EXPOSURES IN THE DESERTS OF 



SOUTH CENTRAL UTAH 



BY J. E. TALMAGE 



A brief abstract is published in Science, February 9, 1900, volume xi, 

 page 220. 



PECULIAR MARKINGS ON SANDSTONES FROM GLEN CANYON, ARIZONA 



BY J. E. TALMAGE 



A brief abstract is published in Science, February 9, 1900, volume xi, 

 page 220. 



