372 r*. E. SAVAGE ALEXANDRIAN SERIES IN MISSOURI AND ILLINOIS 



2, 3 . tfdgewood limestone ? Feet 



3. Yellow to brown, earthy limestone, with few or no fossils 4% 



2. Reddish-brown, iron-stained oolite (Noix oolite member ?) 3% 



A break in sedimentation. 



1. Maquoketa shale: Bluish-gray, plastic shale, with no fossils 4-8 



In the upper part of the Sexton Creek limestone exposed at this place 

 is a layer containing Clathropora cf. frondosa, Rhinopora near verru- 

 cosa, Stricklandinia triplesiana, Stricklandinia n. sp., and Triplecia 

 ortoni, which corresponds to the laj-er containing similar fossils, and 

 occurring 18 to 20 feet below the top of the Sexton Creek limestone in 

 the vicinity of Hamburg. 



In the following table of fossils a cross in column 1 opposite the name 

 indicates that the species was found in the Sexton Creek limestone in the 

 vicinity of Hamburg and Pleasant Hill, while a corresponding cross in 

 column 2 shows that the species was obtaired from the Sexton Creek 

 limestone below Custer Park: 



Fossils from the Sexton Creek Limestone 



Near 

 Hamburg 

 Pleasant 



and 



Hill 



(1) 



Clathrodictyon vesiculosum Nieh. and Murie X 



DiphyphyUum cwspitosum Hall 



Favosites favosus Goldfuss X 



Haiysites catenulatus Linmeus X 



Lyellia sp • X 



Syringolites cf. huroncnsis Hinde X 



Syringopora sp X 



Syringostroma sp X 



Thecia sp X 



Zaphrentis sp X 



Callopora sp X 



Clathropora cf. frondosa Hall 



Rhinopora near verrucosa Hall X 



Rh inopora sp X 



Atrypa marginalia (Dalman) X 



Atrypa reticularis (Linnaeus) X 



Camarota?chia acinus var. convexa Foerste x 



Camarotoochia sp X 



CJorinda ? sp X 



Dahnanella elegantula (Dalman) X 



DalmaneUa sp X 



Leptwna rhmboidalis (Wilckens) X 



Orthis flabcllitcs Foerste X 



Pentamerus oblongus Sowerby X 



Pcntamcrus sp X 



Platj/ttrnphia daytonensis Foerste X 



Near 



Custer Park, 



Illinois 



(2) 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 

 X 



X 

 X 

 X 

 X 



X 



