A-0. 1814 NETTELROTII FOSSIL COLLECTIOX — BASSLKR I29 



RJiombopora angiistata Ulrich. 



Rhombopora clegantiila Ulrich. 



Rhombopora incrassata Ulrich. 



Streblotrypa major Ulrich. 



Fenestella compressa Ulrich. 



Fenestclla rcgalis Ulrich. 



Fenestella triscrialis Ulrich. 



Thamniscus divaricans Ulrich. 



Thamniscits sculptiUs Ulrich. 



Ptilopora cyl'mdracca Ulrich. 



Cystodictya americana Ulrich. 



Cystodictya pustulosa Ulrich. 



Cystodictya lincata Ulrich. 



Meekopora ? aperta Ulrich. 



Athyris lamellosa L'Eveille. 



Spirifcr mortonana Miller. 



Spirifcr suborbicularis Hall. 



Syringothyris tcxta Hall. 



Rhipidomclla ozvcni Hall and Clarke. 



ProductcUa arcuata Hall. 



Chonetcs logani Norwood and Prattcn. 



Chonetes illinoisensis Worthen. 



Goniatitcs bro-t^'nciisis Miller. 



Feet 

 Rockford (Goniatite) limestone (Kinderhook) ■ 1-3 



Calcareous shale and fine-grained, ferruginous limestone with 

 conchoidal fracture; brown when weathered, but mottled 

 green upon fresh exposure. In places an abundant fauna is 

 preserved, of which the cephalopods Brancoccras ixion Hall 

 and Munsteroceras ozveni Hall are best known. Other species 

 are Palaacis enornie Meek and Worthen, Amplexiis rock- 

 fordcnsis Miller and Gurley, Spirifcr marioncnsis Shumard, 

 Spiriferina solidirostris White, Euoinphalits lens Hall, Prod- 

 romites gorbyi Miller, Sohniscus rockfordensis Miller, Tre- 

 matodiscus trisiilcafa Meek and Worthen, and Orodus mulfi- 

 carinatns Meek and Worthen. 



Devonian black shale (New Albany shale) 100 



Black fissile, often bituminous shale with few fossils. Lcior- 

 Jiynclius quadricostatiim Hall, Chonetes lepidus Hall, StyVwla 

 Ussnrclla Hall, Lunulicardium fragile Hall, Schicobolus coii- 

 centriciis (Vanuxem), Lingula spatnlata Vanuxem, and 

 BarroiseUa subspatulata Meek and Worthen have been noted. 

 The lowest layer of the shale is almost invariably made up of 

 an iron band 2 inches thick; in some places this band is con- 

 glomerate, the pebbles being most abundant in the hollows of 

 the underlying limestone. 



Devonian limestone : 



Sellersburg formation (Hamilton) 8 



White to gray crystalline crinoidal limestone with the basal 

 layer frequently arenaceous and containing small phospliatic 



