REPORT OP THE STATE PALEONTOLOGIST 1902 



1023 



The same horizon is exposed in the cliff on the west side of the 

 main ravine and in the creek bed below the highway bridge 14 

 mile farther south. 



The scraggy layer at the top of the Rhinestreet shale outcrops 

 at the lake level at Fox's point on the south side of Dibble bay 2% 



miles west of Angola, and about 60 feet 

 of the light shales next above it and 

 several rows of the large concretions are 

 exposed in the escarpments along the 

 shore for a mile to the mouth of Mud 



nodular shale 



JOO 



35 



I >'l «'g-^T5- 



light blue 



and olive 



shale with 



thin black 



and 



concretionary pppplr 



light soft , 

 shales with 

 large flat 

 concretions 



light shales 



with 



concretions 



The rock exposure on Big Sister creek 

 begins about a mile from the lake shore. 

 About 50 feet of the Rhinestreet shale 

 may be seen in the bottom and sides of 

 the creek in the vicinity of Evans and 

 southeastward to the escarpment on the 

 north side of the Angola cemetery. At 

 the foot of the south end of this low cliff 

 the concretionary layer crosses the chan- 

 nel, and it can be traced in the cliff, 

 rising rapidly toward the north. 



Between this layer and a soft cal- 

 careous sandstone 4 inches thick, con- 

 taining many nodules of iron pyrites that 

 is exposed in the cliff on the north side 

 of the creek 20 rods above the Lake 

 Shore Railroad bridge at Angola, there 

 are 68 feet of light soft shales, in which 

 there are a few thin, black layers and 

 several rows of flattened concretions, 

 from 2 feet to 4 feet long and 8 inches to 

 12 inches thick, besides many smaller 

 ones. 

 Manticoceras rhynchostoma 



and other cephalopods occur, finely preserved in the concretions 



and the shales contain a few lamellibranchs. 

 This horizon is the same as that at the top of the previously 



described section on Eighteen Mile creek. It is also exposed 



light and 

 dark shales 

 with 

 concretions 



Fig. 10 Section on Big 

 Sister creek from Evans Cen- 

 ter to Pontiac. Station 52 



