320 Rowley — Edgewood Limestone of Pike County, Mo. 



At some localities the oolite is in two layers and white, 

 while at others it is brown, and again in but one la3 7 er of a pale 

 blue color. 



Corals of the cyathophylloid, favositoid and lyellioid forms 

 are often abundant in the oolite, especially along the line of 

 separation between the two layers, but the most trustworthy 

 guide fossils are Atrypa tubulistriata and Cyclonema dayton- 

 ense. At the Edgewood locality the corals occur sticking in 

 the rock like plums in a pudding, and the slopes of the low 

 hills on either side of the brook yield beautifully preserved 

 specimens. 



Of the species of fossils that extend through the entire thick- 

 ness of the Edgewood beds may be mentioned Leptmna rhom- 

 boidalis, Orthis Jlabellites, Favosites subelongus, H aly sites cate- 

 mdatus, ClatJwodictyon vesicidosum / and of the genera rich in 

 species: Schuchertella, Dalmanella, Homceospira, Bellerophon, 

 Favosites, Lyellia and Streptelasma. 



As represented in the northern and eastern parts of Pike 

 County, Missouri, the Edgewood formation lies between the 

 Devonian ? shales (Grassy Creek) above and the Buffalo shales 

 (Maquoketa or Richmond) below, while in the southern district 

 it is overlain by a few feet of brown fossiliferous Onondaga 

 limestone that separates it from the grassy shale. 



Louisiana, Mo. 



