1028 



NEW YORK STATE MUSEUM 



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Laona 

 sandstone 



in a field quarry 50 rods north; also in a small quarry 5 miles 

 southwest from Brocton near the lake road, in the sides of a 



small ravine and in a quarry similarly 

 situated 1 mile farther southwest. 



The sandstones in this horizon are 

 constantly thinner bedded and less 

 compact in the exposures southwest 

 from Forestville, and they appear in the 



Portland gray 



conlfretlon^and u PP er part of the cliffs on the lake 

 shore northeast from Barcelona (Port- 

 land Harbor) as a band of flags and 

 thin sandstones and disappear under 

 the waters of Lake Erie about a mile 

 southwest from the mouth of Chautau- 

 qua creek and 9 miles northeast from 

 the Pennsylvania line. 



The sandstones of the Shumla horizon 

 are exposed in the sides of Chautauqua 

 creek ravine in the village of Westfield 

 near the milldam, and in the cliffs along 

 the lake shore from 1% to 3 miles north 

 of the state line, and they come down to 

 the lake level under the gravelly beach 

 y-2 mile north of the state line. 



Fossils of any description are exceed- 

 ingly rare in the shales and flags be- 

 tween the horizons of the Laona and 

 the Shumla sandstones along the lake 



Cashaqua shale 



Middlesex shale shore, the onlv ones found being a few 



Dunkirk 

 black shale 



Silver Creek 

 light soft shales 



Angola soft 

 shales with 

 concretions 



Rhinestreet 

 black shale 



Bfi = sj Genesee shale 



Fig. 13 Section on Lake Erie 

 from top of Hamilton to top of 

 Laona sandstone. Stations 50- 

 64 



small brachiopods in the intermediate 

 beds on Chautauqua creek and in about 

 the same horizon in the bed of a small 

 creek that flows into the lake near a fishing station 4 miles 

 southwest from Westfield. 



At Northeast Pa. Chemung brachiopods were found in small 

 calcareous masses on the uneven upper side of a 4 inch flag and 

 on the lower surface of a similar flag 5 feet higher, both of 

 which are exposed in the bed of Twelve Mile creek, % mile 

 from the lake and about 30 feet above it. 



