10 



Indiana University Studies 



into the Mitchell limestone. The name proposed for this 

 lithologic unit is the Beaver Bend limestone from a con- 

 spicuous bend in Beaver Creek just east of Huron, Lawrence 

 County, Ind., where the Baltimore and Ohio Railroad cuts 

 thru a spur on the inside of the bend. Its entire thickness 

 of 14 feet may be seen there near the bottom of the cut. It 

 is the Upper Gasper of Kentucky, as seen in the region of 

 Sample, where the Sample sandstone divides the Upper Oolite 

 into an upper and lower member. The Beaver Bend lime- 

 stone appears locally thruout the length of Beech Creek, ex- 

 cept to the east, where the Elwren sandstone in an unusually 

 thick mass comes down and occupies the position of the eroded 

 portions of several members, including the upper part of the 

 Mitchell limestone, as mentioned above. 



The Brandy Run Sandstone Horizon. Above the Beaver 

 Bend limestone occur some 10 to 20 feet of gray-blue shales 

 and sandy shales, overlaid in turn by another thin limestone. 

 This interval represents the stratigraphic position of a sand- 

 stone which farther south in Indiana becomes quite promi- 

 nent, and reaches a thickness of 30 to 50 feet. The latter 

 is excellently developed in the region of Marengo, on Brandy 

 Run Creek, and the name Brandy Run sandstone is proposed 

 for the formation. It thins out south of the Ohio River, and 

 is absent beyond Breckinridge and Meade counties, Ky. The 

 horizon has little physiographic interest in the region under 

 discussion. ^ 



The Reelsville Limestone. The thin limestone mentioned 

 above, 'which overlies the horizon of the Brandy Run sand- 

 stone, is typically only 2 feet thick. It is a compact to semi- 

 crystalline limestone, frequently quite oolitic in texture, and 

 almost always sub-oolitic. It contains considerable pyrite 

 which causes it to weather to a characteristic red color. The 

 remarkable feature of this limestone is its persistence over 

 a wide area. It is found at Reelsville, Putnam County, Ind., 

 from which locality it is proposed that it be named. From 

 there southward it forms a single consistent ledge, until 

 middle Crawford County is reached, where several other thin 

 ledges come in on top of the main one. It can be traced over 

 a wide area in Meade and Breckenridge counties, Ky., and 

 is there rarely over 10 feet in thickness. Its fauna is closely 

 allied to that of the Gasper Oolite. It is of little or no im- 



