342 



CHARLES S. PROSSER 



Section of the Maxwell Quarry 



Total 

 Thickness 



Thickness 

 No. Feet Inches Feet Inches 



19. Springfield dolomite. — Light gray, weathering 



to whitish color on surface, and splitting into 



layers varying from 2 to 6 inches. Impression 



of Calymene niagarensis Hall about 1 foot below 



the top of this zone 2 6 25 8 



iS. Light-gray layer with Pentamerus oblongus 



Sowerby common in its lower 3 inches 5 23 2 



17. Mottled zone. — Massive zone of mottled-colored 



dolomite, gray with light-colored blotches and 



spots, which splits into 2 conspicuous layers on 



part of the quarry wall and more where much 



weathered. Surface rather rough and pitted 



when weathered. 



This zone has been correlated with the West 



Union limestone; but there is some uncer- 

 tainty whether that limestone extends as far to 



the northwest as this locality and consequently 



for the present it is not referred to any definite 



formation 5 6 22 9 



16. Laurel limestone. — Thin-bedded with uneven 



bedding planes. As weathered, rusty to 



brownish color on surface, which extends for 



some distance into the rock 1 10 



15. Light-gray to bluish-gray, compact layer 5 



14. Thin-bedded, light- to bluish-gray zone, with 



irregular bedding planes 10 



13. Compact, light- to bluish-gray layer 5 



12. Rather shaly layer 5 



11. Two compact, light-gray layers, the upper 9 



and the lower 8 inches thick 1 '5 



10. Light-gray, shaly dolomite and blue shale. ... 6 



9. Thin-bedded dolomite splitting into 3 or 4 



layers 1 4 



8. Osgood beds. — Fine blue, argillaceous shale to 



clay 1 8 



7. Rather coarse, blocky blue shale which forms 



the lower part of the shale zone. Nos. 7 and 8 



constitute the shale zone in the upper part of 



the Osgood beds with a thickness of 2 feet 2 



inches 6 



