458 The Upper Devonian Deposits of Maryland 



IV. Section on National Road East of Hancock '■ 

 The Jennings is exposed on the National Road east of Hancock. The 

 lower part of the section is concealed in part and is also complicated by 

 minor folds, as shown b\' the measurements and by the geological structure 

 of the area, so that earlier students were led to false estimates of the 

 thickness of these strata. 



The section described begins at the Eomney-Jennings contact, 200 feet 

 east of the center of the bridge over Little Run east of Hancock, and ex- 

 tends 6737 feet eastward to the Jennings-Catskill contact. 



Catskill FORXrATIOX 

 Red shale and sandstone. 



«5 « y* 



Jennings Formation 





c-^ be ' 



Chemung Sandstone Memher o*"c3 



" = , 





i 



c 



Pi 





3989 



161 



3989 



161 



3828 



95 



3667 



15 



3572 



15 



3557 



8 



3542 



Road N. 77° E. 



Jennings-Catskill contact 6737 



Concealed 6737 



Toll-gate house near fork of road 6537 



Concealed 6537 



Yellow shale, poorly exposed, fossiliferous near the top. . 6337 



Dark-red shale 6217 



Brown shale, weathering yellow green 6197 



Dark-red shale 6177 



Road N. 59° W. 



Argillaceous yellow and green shale 6167 



Arenaceous chocolate-red shale N. 5° E. 52° E 6147 



Argillaceous chocolate-brown sandstone 6137 



Chocolate-red shale 6112 



Dark-yellow shale 6092 



Dark-purple sandstone 6052 



Arenaceous shale 6051 



Dark-purple sandstone 6021 



Chocolate-brown shale 6020 



Argillaceous sandstone and arenaceous shale N. 5° E. 70° 



E. containing at top Spirifer mesastrialis abundant 6000 4 3406 



15 



3534 



7 



3519 



21 



3512 



17 



3491 



34 



3474 



1 



3450 



25 



3449 



1 



3424 



17 



3423 



^Measured by pacing. 



