REPORT OP THE STATE PALEONTOLOGIST 1901 54f 



preservation of the graptolites in the Deep kill beds is largely 

 due. 



5 At the base of the section (see diagram) are found 4 feet 9 

 inches of rock, consisting of rather regular alternations of thin 

 limestones, with thinner layers of shale. These beds still show 

 some irregularity of tilting. The limestone as well as the shale 

 appears to be quite barren of organisms. 



c Then follows a stratum, 2 feet 8 inches, consisting of 

 rapidly alternating gray to reddish gray coarse grained sand- 

 shales and dark, finer grained, highly silicious beds. The lower 

 layers of the latter contain numerous small, angular pebbles of 

 limestone and black hornstone in such quantities that these 

 appear brecciated. 



d This stratum is overlain by 8 inches of thin, dark greenish 

 gray, hard silicious bands with thin intercalations of black 

 shale. The latter contain graptolites in great number. This 

 bed we connote as graptolite bed 1. 



e Thin bedded shales and silicious layers; 1 foot 8 inches. 

 The lowest is a thin limestone band; another is found near the 

 middle. The silicious bands change in places to grits and 

 breccias as in stratum c. Fossils seem to be absent. 



f Greenish gray, hard silicious layers and intercalated deep 

 black shales, forming a stratum which lithologically is like 

 stratum d; 1 foot 9 inches. Like the latter, it carries grapto- 

 lites in great profusion. Indeed, this bed has proved the richest 

 of all in these fossils, and its graptolites are in the best state 

 of preservation. It is here termed graptolite bed 2. The green- 

 ish quartzose bands are perforated in all directions by worm 

 tubes and are covered by carbonaceous blotches apparently 

 originating from seaweeds. i 



g Thin bedded, very hard, gray to black silicious beds, 2 feet 

 9 inches, overlie these graptolite shales. They are not separated 

 by shale partings, and show no traces of organic life. 



h Thin bedded, dark gray, hard limestone, with no indications 

 of organisms but worm tubes; 14 feet 3 inches. The layers 

 possess very uneven surfaces, as if deposited in turbulent water, 



