Richmond G)'onp of Cincinnati Anticline. — Focrstc. 343 
siliferous limestones interbedded with richly fossiliferous 
clays. The Upper Richmond consists of much less fossilifer- 
ous material, varying geographically from soft clay to <"lay 
rock and to massive beds of argillaceous limestone, fairly hom- 
ogeneous throughout the greater part of the vertical section. 
In the vicinity of Aladison, Indiana, the more massive, 
banded, argillaceous limestone is thirty-two feet thick. At its 
base and also higher up in the series, some of the layers show 
ripple marks and sun cracks. Beneath this, the rock is softer, 
more clayey, disintegrates more readily, often forming a clay- 
ey section, fifteen to seventeen feet thick. The base of the clay- 
ey section is formed by a layer, one or two feet thick, which 
evidently at one time formed a thin coral reef. ^Massive spec- 
imens of Colnninaria alvcolata (Favistcila stcUafa of the Ohio 
and Indiana surveys), and Colnninaria halli (C alvcolata of 
most authors of former days) are very common. Many of the 
specimens form masses six inches thick and twelve inches 
broad. A few are a foot and a half thick and nearly three feet 
broad. Specimens of Calopoccia cribriforniis are rather scarce. 
Occasional specimens of Tcf radium minus are found. The 
last named fossil occurs also in layers six feet, and seven and a 
half feet above the coral bed, and in a layer two feet below 
this bed. 
This coral bed may be traced southwestward as far as Han- 
over, and northeastward as far as the northern part of Jeffer- 
son county. Stray specimens of Columnaria alvcolata have 
been found at the same horizon as far south as the D. P. Mon- 
roe locality, one mile northwest of the Pinckney Swan localitv, 
and as far north as Versailles. 
At Versailles, Tetradium minus occurs at all levels in the 
thirteen feet which overlie the layer containing Columnaria 
alvcolata. It is quite abundant in about nine feet of the sec- 
tion. The base of the Tetradium bed at Versailles is, therefore, 
approximately at about the same level as the coral bed at Mad- 
ison. This is believed to be the case also at Laurel, where no 
Columnaria has been found, but where a Tetradium minus 
layer, three to four feet thick, occurs at a corresponding level. 
At Richmond, Indiana, small specimens of Columnaria alvco- 
lata and Columnaria halli, not exceeding two inches in diameter, 
occur associated with Beatricea undulata on Elkhorn creek fif- 
