CtJMBEliLAND SANDSl^ONE OF SOUTHERN KENTUCKY 48o 



clayey limestone with Heheriella occidentalism Byssonychia robusta, and 

 Pterinea deniissa. The bed occurs 33 feet above the river. 



The cliffs immediately above Bakertown landing show near the top 

 several feet of fossiliferous limestone belonging to the Fowler horizon. 

 Passing up stream along the top of the cliffs, an open field shows many 

 fragments of limestone from this bed, many of which are partly cherty 

 and contain fossils. Among these Mr Ulrich identified Isrhyrodonta, 

 three forms, near truncata, Isch. elongata, and Isch. decipiens, Byssonychia 

 robusta, Lophospira bowdeni^ and Bellerophon mohri. The Black shale is 

 not well exposed, but it seems to have occurred about 12 feet above this 

 bed. 



Above the mouth of Crocus creek the Fowler bed appears to be en- 

 tirely absent. 



At Fowler's landing, east of the store, and above the houses along 

 the road leading away from the river, the Fowler bed occurs 21 feet 

 below the base of the Black shale and 96 feet above the river. The 

 layer of limestone at the top is very fossiliferous and contains Hebertella 

 occidentalism Pterinea demissa, a species of Orthoceras, and fossils identified 

 by Mr E. 0. Ulrich as Isochilina variety of subnodosa, Modiolopsis sp., 

 Ischyrodonta near Isch. iruncata, and Glyptodesma gibbosa. About 4 feet of 

 limestone contain fossils, most of these being found in the top layer. 



The Fowler bed appears to be absent at Rock House. 



So far as may be determined from the few observations at hand, a 

 synclinal fold once affected the Ordovician rocks in the neighborhood 

 of the localities here cited. Its trough appears to have passed from the 

 strong bend of the river, north of Burksville, near the mouth of Rennix 

 creek, eastward. The Fowler bed seems to have been preserved in the 

 trough of this fold and to have been removed along the flanks on the 

 north before the deposition of the Black shale. 



Beds above the Fowler limestone. — The greatest thickness of rock above 

 the Fowler bed occurs at the mouth of Rennix creek, and consists of 

 56.5 feet of thin-bedded limestones. No fossils have so far been found 

 in these limestones, but lithologically they bear no resemblance to the 

 Silurian rocks on either side of the anticline along the Cumberland 

 river, and are therefore considered as of Ordovician age. The name 

 Rennix limestones may prove convenient for them. 



Beds below the Fowler limestone. — Below the Fowler bed are usually at 

 least 35 feet within which no fossils are known at any point. They con- 

 sist of about 15 feet of thin-bedded limestone, 5 feet of thicker limestones, 

 frequently with chert, and 15 feet of thin-bedded clayey rock. 



Beneath these unfossiliferous rocks occur a considerable thickness of 

 clayey rocks, very similar to those last mentioned. Their chief distinc- 



LXII— Bull. Geol. Soc. Am., Vol. 12, 1900 



