ART. 22 RICHMOND FAUNAL ZONES AUSTIN 7 



Whiteivater formation (Beds Wh. 1-6) 



Oakland division (Beds Wh. 3-6) : 



Drepanclla richardsoni bed (Wh. 6). Light-colored clay capped by two 

 or three heavy layers of impure limestone 8 to 10 inches thick apparently 

 barren but crow^ded with ostracoda, Drepanella richardsoni, Eurychilina 

 striatomarginata, Leperditia caecigena, Primitia lativia, etc., Licheno- 

 crinus tuberculata, Agelacrinus austini, and Eelopora elegans also 



present 5' 



Ischyrodonta bed (Wh. 5). Alternating thin bedded blue limestone and 

 clay layei's, the latter predominating with the upper beds containing 

 great number of Ischyrodonta decipiens, I. elongata, I. iniscncri, I. 



ovalis, and Ctcnodonta hilli 6' 



Monticulipora cleavelandi bed (Wh. 4). Shelly limestone layers crowded 

 with ramose bryozoa particularly M. cleavelandi and Homotrypa 



austini 3' 



Lower bed (Wh. 3). Nodular clay limestone with the interspaces filled 

 with coarse clay. Dennatostroma glyptus, Bellerophon tnohri, Lichcno- 

 crinus tubcreulatus, Sirophomena sulcata, Hehertella occidentalis, 



Raflnesquina, etc., present 0' 



Middle division (Wh. 2). Alternating clay and limestone layers with the latter 

 predominating. The clays are almost unfossiliferous, the sijecies present 



being attached to the limestone beds 50' 



Lower division (Wh. 1). Clay shale and occasionally layers of limestone con- 

 taining an unusual number of species, among them Homotrypa wortheni, 

 PtUodictya magnifica, Pachydlctya fenstelUformis, Monticulipora parasitica, 

 Xenocrinus haeri, Gyroceras baeri, Arctinurus harrisi, Gomphoceras eos, 

 and Byssonychia richmondensis, while Streptelasma rusticuni is especially 

 abundant and large in the lower part. Base marked by one or more unusu- 

 ally thick clay-stone layers, with Plectamhonites rugosus clarksvillenMs lu 

 great abundance 10' 



Liberty formation. (Beds L. 1-3) 



Upper beds (L. 3). Thick clay beds interspersed with rather thin (2 to 5 

 inches), even-beddod limestone layers abundantly fossiliferous l)ut with the 

 fossils usually attached to the limestone. 



Constcllaria limitaris bed (L. 2.) Fosuiliferous clays and thin-bedded lime- 

 .stone holding Constellaria limitaris in abundance associated with Gyroceras 

 haeri, Cupulocrinus polydactyhis, Dlnorilils subquadrata, Phragmolites dyeri, 

 Dalmanites breviceps, etc. With these normal-sized species are dwarf forms 

 of Plectambonites rugosus clarksvillensis, Strophomcna planiimhoria, Pfcrinea 

 demissa, and Calymene ineckl 10' 



Basal beds (L. 1). Heavy clay-stone layers marking base of Liberty. 



Waynesville formation (Beds W. 1-17) 



Blanchester division (Beds W. 8-17) : 



Crinoid bed (W. 17). Compact, fine grained green blue clays wiih the 

 crinoids Glyptocrinus fornshclU, Canistrocrimts richardsoni, Compso- 

 erinus miamiensis, Dendrocrinus casei, Reteocrinus nealli, and Hetero- 

 crinus juvenis and the nierostome Megalograptiis irclrhi 6' 



Upper HeberteUa insculpta bed (W. 16). Shaly limestone layers crowded 

 with Hebertella insculpta, Sfrophoniena nutans, .9. neglecta, and other 

 brachiopods in abundance, attached to the limestone 5' 



