PAPERS ON GEOGRAPHY AND GEOLOGY 237 



Dinorthis proavita Winch, and Schuchert (c) Fernvale 

 Hebertella insculpta (Hall) '(c) W. 

 Platystrophia curningsi McE. (c) W. 

 Plectorthis kankakensis (McC) (c) 

 Plectambonites sericeus (Soweiby) (c) W. L. 

 Rafinesquina alternata (Emmons) (c) Richmond 

 Rhynchotrema capax (Conrad) W. L. Wh. 

 Rhynchotrema perlamellosum ("Whit.) 

 Strophomena neglecta (Jauie?) W. 

 Strophornena planumbona (Hall) W. L. 



The species of fossils in the above list leave no doubt of 

 the Fernvale age of the lower or limestone part of the 

 Richmond section in the Bock Run locality. 



Along the banks of Aux Sable creek for a distance of 

 one and one-half to two and three-fourths miles north- 

 west of Minooka, Illinois, fossiliferaus strata belonging 

 in the middle part of the Richmond, as there developed, 

 are exposed in several places. They consist of alter- 

 nating layers of shell limestone and calcareous shale in 

 the lower part, grading upward into rather dense gran- 

 ular limestone; the strata are nearly horizontal, the entire 

 thickness seen aggregating 10 to 15 feet. The species 

 of fossils collected from this limestone along Aux Sable 

 Creek are listed below: 



LIST OF FOSSILS FROM LIMESTONE ALONG AUX SABLE 

 CREEK, NORTHWEST OF MINOOKA 



Amplexopora ampla U. & B. (r) 



Batostoma sp. (r) 



Bythopora delicatula (Nich.) (r) W. L. Wh 



Bythopora meeki (James) (aa) W. L. Wh. 



Bythopora striata Ulr. (r) W. 



Eridotrypa simulatrix Ulr. (r) W. 



Hallopora cf. onealli (r) 



Hallopora subnodoba (Ulr.) (c) Richmond 



Hallopora cf. subplana (r) 



Homotrypella rustica Ulr. (c) W. L. Wh. 



Homotrypella rustica var. (c) 



Mesotrypa orbiculata C and G. (r-c)' A 



Stigmatella crenulata U. & B. (r) W. 



Stigmatella interporosa U. & B. (r) W 



Stigmatella nicklesi U. & B. (r) 



Stigmatella spinosa U. & B. (r) W. 



Stigmatella spinosa yorkvillensis (c) 



Stomatopora arachnoidea (Hall) (c) 



Dalmanella testudinaria (Ualman) (c) 



Dinorthis subquadrata (Hall) L. Wh. 



Dinorthis proavita (Winchell and Schuchert) (r) 



Hebertella insculpta (Hall) (r) W. 



Hebertella occidentalis (Hall) (r) L. Wh. 



Platystrophia cumingsi McE. (r) W. 



Plectorthis kankakensis (McC.) (r) 



