ABSTRACTS OF PAPERS 131 



A paper on the correlation of Mohawkian formations in Tennessee and 

 Kentucky was then presented b}^ the author, who, in outlining the scope 

 of his remarks, asked the members to delay judgment upon a recent 

 publication on the same subject until further facts had been printed. 

 The author then presented many valid reasons for this request. 



RELATION'S AND OVERLAPS OF ORDOVICIAN FORMATIONS IN KENTUCKY 



AND TENNESSEE 



BY E. O. TJLRICH 



President Matthew then, in the few minutes remaining of the after- 

 noon session, presented a digest of the following paper : 



STRATIGRAPHY OF THE SNAKE CREEK FOSSIL QUARRIES AND THE 

 CORRELATION OF THE FAUNAS 



BY W. D. MATTHEW 



(Al)stract) 



The Snake Creek fossil quarries, 20 miles south of Agate, Sioux County, 

 Nebraska, were discovered by H. J. Cook and the writer in 1908. They have 

 yielded a great quantity and variety of vertebrates of later Tertiary age, 

 mostly fragmentary, but including a considerable number of skulls and more 

 or less complete skeletons. Mammals, and especially three-toed horses, are 

 the most abundant. 



Field observations and study of the collections indicate that three distinct 

 faunas are represented and a fourth less clearly distinguishable, as follows : 



? 4. PUohippus leidynnus zone ( doubtful ) : ) Lower 

 3. Hipparion affine zone : ( Pliocene. 



2. MerycMppus paniensis zone : Late Middle or Upper Miocene. 

 1. MerycMppus primus zone : Early Middle Miocene. 



The pockets from which the great bulk of the material has come are chan- 

 nel-beds excavated in and partly contemporary with fine-grained muddy sand- 

 stones, to which the name of Sheep Creek beds was applied when first found. 

 These appear to be back-water sediment corresponding in age to horizons 1 

 and 2 of the channel-bed series. No back-water facies has been recognized for 

 the Pliocene channel-beds (No. 3). These are overlain by eolian dune-sands, 

 which constitute the top of the formation and are considerably compacted 

 near the old surfaces. These eolian beds contain a scanty Pliocene fauna, 

 doubtfully separable from No. 3. 



The American Museum Expedition of 1922 secured a large collection from 

 the channel-bed facies of the M. primus zone. 



At 5.30 p. m. the Society adjourned until the following day. 



Friday evening, at 7 o'clock, at the Michigan Union, the members at- 

 tended the annual dinner of the Geological Society of America and 

 affiliated societies. 



