Geology and Mineralogy. 239 
II. GeoLtoagy AND MINERALOGY. 
1. Gravel a referred to the Drift, in Boone County, 
Kentucky.— GrorGE Surron states (Proc. Amer. <Assoc., 
1876, p. 225), that on the highest part of the table-land in Boone 
Comity, Kentucky, 450 to 500 feet above hi igh-water mark in the 
the mouth of ratte Creek, at about the same e height as shoei ver- 
terrace formation in Keeney That of Hogan Creek consists of 
laminated clay and loam with very little gravel, and, as the author 
remarks, “ was evidently formed away from the current of the 
Ohio Riv 
2. Gr raed Ridges in the Merrimack valley.—Mr. G. F. Wricnt 
describes the gravel ridges connected with the Quaternary of the 
Merrimack valley, in the vicinity of Andover and both south and 
north of that place, in the Proceedings of the Boston Society ot 
Natural History for December, 1876. At Andover there are 
three such ridges, at a height of 82 , 90, and 132 feet above the 
bed of the river, Piha highest being most remote from the stream. 
They are often only wide enough at top for a foot path. The 
ourses of the ridges are more or hs tortuous, and they are 
they are not in all parts stratified. The pie materia 
