Maryland Geological Survey 57 



Marcellus Member ppp^ Total. 



No. 9. Hard fissile black shale with some thin bands of blue lime- 

 stone full of Ambococlia virginiana. (Local folding within this ter- 

 rane makes impossible any close or precise estimate of thickness) . . lOOdr 320 



No. 8. Band of black limestone concretions 1 220.5 



No. 7. Hard fissile black shale Styliolina ftssurella nearly barren 115 219.5 



Onondaga Member 

 No. 6. Dark gray impure limestone in i/^ to 1 inch bands inter- 

 bedded with black bituminous shale, Strophalosia truncata and Cen- 



tronella cf. ovata abundant in some bands of limestone 15 104.5 



No. 5. Dark lead-gray to blackish shale 40 89.5 



No. 4. Lead-gray blocky shale slightly calcareous with numerous 



goniatites and pelecypods in certain bands 6 49.5 



No. 3. Dark lead-gray blocky shale with some slightly calcareous 

 bands: Dalmanella lenticularis, Modiomorpha subalata. Panenka 

 alternata. Panenka cf. dichotoma, Panenka obsolescens n. sp., 

 Panenka cf. multiradiata, Agoniatites expansus, PJiacops cristata 



var. pipa 30 4o.b 



No. 2. Soft dark gray to black argillaceous shale 12 13.5 



No. 1. Fissile soft black shale with well rounded sand grains 

 rather common 1.5 1.5 



Oriskaxy Formation 



Drab or brownish soft shaly sandstone 1 



Gray very hard coarse sandstone with Oriskany fossils, dipping 

 east 12 



The strata of this section which are assigned to the Onondaga shale 

 include beds 1 to 6, a total thickness of ahout 105 feet. In the lower 

 part of the shale below division 3 fossils are scarce with the exception of 

 Anoplotheca acutiplicata which is a common species at this horizon. The 

 next higher bed, 3 of the section, contains a rich fauna as shown by the 

 foregoing list. 



The succeeding division of the section appears to contain few fossils and 

 none were collected from it. 



The 15 feet of dark bituminous limestone at the top of the Onondaga 

 contain in some bands great numbers of minute brachiopods. The two 

 species Centronella cf. ovata and Strophalosia truncata comprise a large 

 proportion of the material of some of these bands. 



The next 100 feet of these shales represent the Marcellus. The only 

 fossil observed in them is Styliolina fissiirella which occurs in abundance 

 in certain beds in the upper part. 



