1 68 CHARLES S. PROSSER 



Myalina cf. recurvirostris M. & W. (rr). Beak is gone and the specific 

 identification is not positive on that account. 



The rocks at the eastern end of this quarry are well shown in 

 Fig. 3 of the pictures, the heavy stratum near the bottom of the 

 picture forming the top of No. i, which is succeeded by Nos. 

 2-5 of the section. 



The quarry limestone, No. i, of the above quarry is the same 

 stratum as No. 9 (the quarry limestone) in the eastern part of 

 the Green quarry. The yellowish shales, Nos. 12 and 13, of the 

 eastern part of the Green quarry. No. 2 of the western part, and 

 No. 4 of the Cooley quarry are the same stratum. In the Green 

 quarry the Dakota sandstone rests on either theseyellowish shales 

 or the overlying limestone (No. 3) of the western part of the Green 

 quarry ; but in the Cooley quarry there is no Dakota sandstone, 

 though Carboniferous rocks with a thickness of eleven feet ten 

 inches are shown above the yellowish shales. In the Green 

 quarry these rocks, with the exception of the limestone. No. 

 3, in its western part, were eroded before the deposition of 

 the Dakota sandstone. The above data obtained on compar- 

 ing the Cooley and Green quarries show that the Dakota 

 sandstone was deposited in a very irregular Carboniferous 

 £oor. 



The massive quarry limestone in the quarries north of the 

 Platte River, No. 9 of the Green and No. i of the Cooley, is the 

 same stratum as that quarried in the Parmlee quarry, No. i, on 

 the south side of the river. The difference in elevation of the 

 base of this limestone on opposite banks of the river, 1097 f^^t 

 A. T. on the north side, and 1070 on the south side, may be due 

 partly to an error in the barometric record, though there is prob- 

 ably some dip in that direction. In the Parmlee quarry fifteen 

 feet, eight inches of Carboniferous rocks are exposed above the 

 top of the quarry limestone, No. i of the section, without show- 

 incr the Dakota; in the Cooley twenty-three feet are exposed, 

 and in the eastern part of the Green quarry there are ten feet 

 capped by the Dakota. This comparison between the north and 

 south sides also shows the irregularity of surface upon which the 



