342 G. H. CHADWICK STEATIGRAPIIY OF NEW YORK CLINTON 



Dactylophycus pes-avis, nom. no v. Lcpfodesma rhomhoidea 



Ichnopliycus tridactylus Pyroiomocus euiieafus 



Conostichusf^nedusa, nom. iioY. Bucanclla trilohata 



Conosticlmsf polygonatus, nom nor. Bcynchia lata 



Camarotcecliia aquiradiata Bollialata (?) 



Ptcrinca emacerata Tracks and trails (3:27-20) 



MARTVILLE SAXDSTONE 



The type locality is Bentley's quarry (1: 89^ 78, 14), intermediate be- 

 tween Martville and Hannibal (the latter name is preoccupied in stratig- 

 raphy), where about 10 feet of thin grayish green sandstone and shale, 

 mth fossils, are seen at the top of the quarry resting with a shale contact 

 on the four or five feet of light gray or slightly mottled sandstone con- 

 sidered Oneida (or Thorold) by Yanuxem, below which is the red Medina 

 sandstone. The Martville is uppermost of these three sandstones and 

 carries — ^ 



"Numerous fucoids and other forms*' (compare the preceding list). 



Lingula clinioni (L. ohlonga Conrad), "besides some other fossils" 

 (1:89). 



Probabl}" also DoUcliopterus? prominens (Paleontology of New York, 

 volume 7, page 157; Memoir 14, page 200). 



This stratum appears to be only three or four feet thick in the ]\[artville 

 well, where it lies beneath the horizon of the Furnaceville ore with an 

 intervening breccia, the ore being aljsent and the Eeynales limestone suc- 

 ceeding. Though similar conditions exist in the Yerona well, whence the 

 sandstone extends eastward through the Blackstone quarry and eventually 

 merges into or is supplanted by the red Otsquago sandstone, yet in the 

 territory adjacent to Martville it is unrecognized in the sections, its place 

 being taken by a calcareous or a limestone-interlarded shale. Whether 

 this is contemporary or successive is not now evident, but since it is a 

 marked zone with black pebbles in its upper layer in five consecutive wells 

 and again in the well at Lakeport (compare text-ilgure 4) it is here given 

 separate consideration. The problem of these thin lentils in the lower- 

 most Clinton will be considered in the chapter on "Physical History." 



BEAR CREEK SHALE 



At the old "Wolcott ore bed" on Bear Creek (9 : 68, Black Creek of 

 the topographic map) Hall found an interesting pelocypod fnunn (3: 70- 



8 Professor Schucliert pertinently inquires whether these Martville and Bear Creelv 

 faunas may not be Medina rather than Clinton in content. To the writer they seem 

 rather to help efface the old sharp line between the two "groups." 



