Rowley — Edgewood Limestone of Pike County, Mo. 3L9 



lithologically, or should be regarded as another member of the 

 Edgewood formation. 



Three miles north of the town of Edgewood and about three 

 miles east of Cyrene is Savage's type locality of the Edgewood 

 formation, the basal beds, here richly fossiliferous, consisting 

 of thin layers of a fine-grained clay limestone that directly 

 overlies the Maquoketa or Buffalo shale. 



Dalmanella edgewoodensis, Schuchertella missouriensis, 

 Dalmanites danai, and Atrypa putilla are the characteristic 

 fossils of the Cyrene limestone. The type locality for this 

 member is generally known as the Wigginton place, and is at 

 the foot of a hill locally known as Buffalo Knob. The five 

 or six feet of Cyrene beds here are overlain by a coarser and 

 heavier brown limestone, locally bluish and massive, of con- 

 siderable thickness that outcrops along the hillside. This is 

 the Watson limestone, above which are eight to ten feet of a 

 very sandy yellowish blue shale, the equivalent of the Bowling 

 Green limestone. Less than a mile north of the town of 

 Edgewood is an outcrop representing all the members of the 

 Edgewood formation except the oolite, the Cyrene member 

 overlying directly the Ordovician (Buffalo) shale. Above the 

 two or three feet of Cyrene limestone is the coral horizon, 

 which is thirty-six to thirty-eight inches thick, and which is 

 the equivalent of perhaps the whole of the Watson limestone, 

 though the lower part also embraces the Atrypa putilla zone 

 of the Cyrene member. For a mile or two down the branch 

 that has exposed the rocks at this locality, favositoid, thesioid 

 and lyellioid corals occur in great numbers, with occasional 

 specimens of Atrypa prcemarginalis and a rhynchonelloid. 

 The two layers of this Edgewood locality, five or six feet thick, 

 are of the Bowling Green member. 



The Silurian beds at McCune station on the " Short Line" 

 or Hannibal and St. Louis R. R., represent the Cyrene, Wat- 

 son and Bowling Green horizons. The characteristic fossils 

 are Atrypa putilla and A. prmnarginalis. 



At one locality along the road from the Wigginton place to 

 the town of Edgewood the following section was observed : at 

 the top are nine or ten feet of what appears to be a yellow-blue 

 sandy shale, or rather a fine-grained yellowish laminated sand- 

 stone, with many casts of small fossils, then seven or eight feet 

 of a massive pale blue limestone with few recognizable fossils, 

 at the base three or four feet of flaggy Cyrene limestone rest- 

 ing on two or three inches of a bluish oolite. Immediately 

 below the oolite is a flaggy Ordovician shale (Buffalo) with a 

 scant fauna of Richmond fossils. Half a mile further west 

 the oolite is entirely wanting. 



