146 The Lower Devonian Deposits of Maryland 



Horizontal Vertical Total 

 distance thickness vertical 

 feet feet thickness 



Thin-bedded gray limestone, cherty and shaly 

 towards the bottom. At the bottom occur crinoids, 

 Batostomella interporosa, Diplostenopora siluriana, 

 Fistuliporella marylandica. Orthopora rhomhifera, 

 Tentaculites gyracanthus and Stropheodonta sp 99.0 2.2 92.3 



Shaly, gray, extremely argillaceous limestone. At 

 the top of this unit occurs a bed extremely prolific 

 in bryozoa, Batostomella interporosa. Diplostenopora 

 siluriana, Fenesteila cumberlandica, Fistuliporella ma- 

 rylandica, Ptilodictya tenella, crinoids (aa), Rhyncho- 

 spira (r), Stenochisma sp., Stropheodonta sp., Khr- 

 denella turgida. Octonaria inequalis, 0. angulata, Pon- 

 tocypris arcuata 96.8 3.0 90.1 



Concealed. 



On the slope of the hillside facing the road were 

 found throughout this unit crinoid stems, Batosto- 

 mella interporosa, Stromatotrypa glohularis, Diplo- 

 stenopora siluriana, Fistuliporella maynardi, F. mary- 

 landica, Orthopora rhombifera, Ptilodictya tenella, 

 Rhopolonaria attenuata, Stenochisma sp., Atrypa 

 reticularis (c), Spirifer vanuxemi (r), Octonaria ine- 

 qualis, 0. angulata, Kladenella turgida, Primitia ? 

 cumberlandica, corals 93.8 14.0 87.1 



Thin-bedded arenaceous limestone standing out like 

 a backbone containing crinoids. Loose on the hillside 

 were found Diplostenopora siluriana. Fenestella {Cy- 

 cloporina) altidorsata, Fistuliporella marylandica, 

 Orthopora rhombifera, Ptilodictya tenella, Polypora 

 dictyota. Spirifer octocostatus, Stenochisma sp., Stro- 

 pheodonta sp., Schuchertella cf. deckerensis, Lepi- 

 docrinus gebhardi (t) , crinoids (aa.) 79.8 4.0 73.1 



Concealed. 



In this unit on the hillside were found Batostomella 

 interporosa. Eridotrypa parvulipora, Fenestella (Cy- 

 cloporina) altidorsata. Fistuliporella marylandica. Or- 

 thopora rhombifera, Polypora dictyota. Rhopolonaria 

 attenuata, Thamniscus regularis, Stenochisma formosa 

 (t), Gypidula coeymanensis var. prognostica. crinoids 75.8 9.0 69.1 



Blue argillaceous thin-bedded limestones. This is 

 the Gypidula coeymanensis prognostica zone. At the 

 bottom was found Chonetes jerscycnsis (r) 66.8 2.1 60.1 



Dull blue-gray arenaceous limestone, thin-bedded at 

 the top. Oypidula coeymanensis var. prognostica and 

 Rhipidomella emargin^ta (r) at the bottom 64.4 4.5 58.0 



Heavy-bedded gray limestone weathering somewhat 

 hackly on the surface, arenaceous. At the bottom 

 occur Chonetes jerseyensis (c), and Stropheodonta sp. 59.5 3.1 53.5 



