MARCELLUS LIMESTONES OF LANCASTER 145 



The fossils found in the bed are as follows: 



Chonetes scitulus Hall co 



Ambocoelia nana Grabau rr 



Orthonota (?) paryula Hall * rr 



Nuculites triqueter Conrad rr 



Panenka lincklaeni Hall rr 



Lunulieardium fragile Hall cc 



Styliolina iissurella {Hall) cc 



Orthocerae eubulatum Hall oc 



Cryphaeus boothi Green rr 



Primitiopsis punctulifera (Hall) c 



Isochilina (?) fabacea Jones c 



Marcellus (Stafford) limestone 



I 12 inches. The lowest bed of the limestone series presents a 

 striking contrast both in lithologic character and in its fauna 

 to the shale which underlies it. This bed has an irregularly 

 hummocky surface of concretionary origin, though it is practi- 

 cally a continuous mass. The rock is compact, dark gray in color, 

 with no tendency toward shaly structure. It is soft and appar- 

 ently contains little silicious matter. 



The whole bed is largely made up of shells of S t r o p h - 

 alosia truncata and A m b o c o e 1 i a nana, the 

 extreme irregularity of fracture being due to the innumerable 

 fragments of these shells, whose black, shining surfaces give the 

 rock a very dark appearance. As might be expected, in the lime- 

 stone the individuals are u'ot at all flattened, but they are usually 

 of small size, for each species. 



As noted above, this bed also occurs in Oayuga creek, where it 

 forms a fall beneath the upper carriage bridge, and it is exposed 

 in the bed of the stream.. It is 12 inches thick and the character 

 of' the rock is indistinguishable from that of the same bed at 

 Plumbottom creek. The fossils are of the same species. 



In an excavation for a sewer near the corner of Buffum and 

 Seneca streets, in southeastern Buffalo, material from this bed 



