1118 NEW YORK STATE MUSEUM 



37 Cornulites arcuatus Conrad 



38 Beyrichia (2 species) 



39 Calymmene camerata Conrad 



40 0. niagarensis Hall 



41 Dalmanites sp. undet. 



42 Homalonotus sp. 



43 Leper ditia jonesi Hall 



44 Lichas (Dicranogmus) ptyonurus Hall 



45 Proetus sp. undet. 



At this place the three system cleavage has caused the upper 

 part of the rock at several points to become broken, so that the 

 appearance is not unlike piles of pebbles. These pebbles often 

 yield choice fossils of the smaller species, while the larger species 

 are sometimes found in sections, being cut by the formation of 

 cleavage planes. This method of weathering and in places the 

 removal of the weathered material have left the harder portion, 

 representing colonies of coral extending above the general sur- 

 face of the rock. The appearance of these coral masses indicates 

 that this was their original place of growth, and thus a locality 

 favorable for the existence of other types of life illustrated by 

 the fauna above given. That these coral beds were the habitat 

 of many of these life forms is shown by the occurrence of 

 Trochoceras gebhardi and large gastropods, resting on 

 the summits of a coral growth. These gastropods, in turn, are 

 seen to be places of attachment for new coral polyps, thus finally 

 embedding the shells in the coral mass. Trochoceras geb- 

 hardi is also found as the nucleus of large concretions, the 

 surrounding mass of which is made up largely of coral growth. 



Below, in the more compact portion of the rock, there is a 

 layer in which Chonetes jerseyensis Weller occurs in 

 abundance. Associated with this species were found two fine 

 specimens of Calymmene niagarensis Hall, the pygid- 

 ium -of Lichas (Dicranogmus) ptyonurus Hall, 

 fragments of Homalonotus sp. ; also a number of Proetus sp. and 

 several specimens of the cosmopolitan brachiopod A t r y p a 

 reticularis Linn., which however is but rarely found in the 

 Cobleskill. Fragments of a brachiopod which in general form 



