92 Cincinnati Society of Natural History. 



Prof. Leo Lesquereax'^described, fi om the Dakota Groiip,north of For t 

 Ellsworth, Nebraska, or its vicinity, Pterophyllum haydeni, Glypto- 

 strobus gracillimus^ Sequoia formosa^ Phyllocladus subintegrifoUus, 

 Arundo creiaceusy Liquidamher integrifolium, Populus lancastriensis, 

 Populites ele'jans, P. Jlabellata, P. Salisbury mfolia^ P. ovata, now 

 Ampelophyllum ovatum^ P. quadrangularis, now Hamamelites quad- 

 rangularis, Salix protecefolia, Betida beatriciana, Fagus polycladus, 

 Quercus primordialis^ nosv Dryophyllum jyrimordiale, Q. Iiexagona, Q. 

 ellswortJianics, Q. anceps, now Diospyros anceps, Q. semialatiis, now 

 Anisophyllum semialatum, Picas ( ?) rhomboideus^ now Phyllites 

 rhomboideus, Ficus (?) Jlmbriatus, now Eremophyllurt), jimbriatum^ 

 Platanus aceroides, var. latior, P. obtusiloba.P. diminutivus.Credneria 

 leconteana, now Protophyllum leconteanum, Laurus macrocarpus. 

 Sassafras miidgei, S. subintegrifolium, Lyriodendron giganteum, L, 

 intermedium^ Magnolia tenuifolia, Dombeyopsis obtusiloba., no\v 

 31 enis2:)er mites obtusilobus, Negundoides acutifolia., Paliurus mem- 

 b^^anaceus, Bhamnus tenax^ Phyllites rhoifolius., Phyllites amorphus, 

 P. umbonatus^ and Prunus cretaceus. 



In Tennessee,! wherever the Cretaceous rocks are exposed, the}' lie 

 upon Palaeozoic strata. They are subdivided into, first, Coffee 

 Sand Group ; second, G-reea Sand Group, or the shell bed; and third, 

 Ripley Group. 



The Coffee Sand Group derives its name from the exposure at Coffee 

 Landing, on the Tennessee river. It outcrops in Hardin and Decatur 

 counties, and overlaps the Western beveled edge of the older rocks. 

 Its outcrop occupies a belt of territor}^ varying from two to eight miles 

 in width, and running more than half way through the State. It has 

 a maximum thickness of about 200 feet. It consists mostly of 

 stratified sands, usually containing scales of mica. Thin leaves of 

 dark clay are often interstratified with the sand, the clay leaves occa- 

 sionally predominating. Sometimes beds of dark laminated or slaty 

 clay of considerable thickness, from one to twenty feet or more, are 

 met with in the series. It ver}^ generally contains wood}^ fragments 

 and leaves, converted more or less into lignite. Silicified trunks of trees 

 are not uncommon. When it passes under Green Sand it becomes the 

 reservoir which fields water when pierced b}' the well-borers. It is 

 the equivalent of the Tombigbee Sand of Hilgard in Mississippi. 



Fossil shells are so abundant in the Green Sand, at some points, 

 that they are gathered by car loads and burned into lime. The maxi- 



=•'■ Am. Jour. Sci. and Arts, 2d ser., vol. 46. 

 t Geo.ofTenn.,1869. 



