520 



The Upper DEvo>fiAX Deposits of Maryland 



Jennixgs Formation '° "> „ 



Chemung Sandstone Member c-ti t«o 



NO — 



Direction of run N. 40° W. 'g c c g- 



Concealed. At bottom of this concealed unit in thin- 

 bedded gray sandstone were found Anihococlia umbonata, 

 Atrypa spinosa, cf. Craniella sp., Dalmanella tioga common, 

 Douvillina cayuta, Schuchertella chemungensis, Spirifer 

 mesastrialis, Leptodesma longispinum small, L. sp., Pteri- 

 nea chemungensis abundant 1911 



*^ o c 



D OJ O 



16 



1524 



Direction of run N. 20° W. 



Concealed 1893 11 1508 



Interbedded arenaceous green shale and gray sandstone. 

 At 1847 horizontally (1474 vertically) occur Ambocalia 

 umbonata abundant, Atrypa spinosa abundant, Craniella 

 hamiltonicB, Dalmanella carinata, D. tioga abundant 

 Chonetes sp., Douvillina cayuta common, Productella lach- 

 rymosa var marylandica ?, P. lachrymosa var. approaching 

 speciosa common, Schizophoria striatula common, Spirifer 

 disjunctus abundant, S. {Delthyris) mesacostalis, Schucher- 

 tella chemungensis abundant, Pterinea chemungeyisis 

 abundant 1878 37 1497 



Direction of run due W. 

 Thin-bedded green arenaceous shale 1828 14 14G0 



Direction of run N. 50° W. 



Heavy-bedded grayish-green sandstone 1811 5 1446 



Largely concealed, with some thin bands of grayish- 

 green sandstone at bottom 1806 57 1441 



Thin-bedded grayish-green sandstone and interbedded 

 arenaceous green shale. At 1680 horizontally (1316 verti- 

 cally) occur Cladochonus humilis, Atrypa hystrix, A. 

 spinosa, Dalmanella tioga abundant, Douvillina cayuta, 

 Schuchertella chemungensis abundant, Productella lachry- 

 mosa var. approaching speciosa, Spirifer disjunctus abun- 

 dant, Pterinea chemutigensis abundant, Pleurotomaria sp. 1749 125 1384 



Direction of run N. 45° W. 

 Concealed 1620 83 



1259 



