3fesozoic and Cmnozoic Geology and PaUnontology. 225 



Oswald Heer* described, from the Tertiary of Alaska, Pteris sitken- 

 sis, Taxodium tinajorum, Taxites microphyllus, Phragmites alaskanus, 

 Poacites tenuistriatiis. Carex servata, Sagitfxiria pulchella, Vaccinium 

 frieoi, Diospyros stenosepala. Viburnum nordenskioldi, Hedera auri- 

 culata, Vitis crenata, Tilia alaskana, celastrus borealis, Ilex insig- 

 nis, Trapa borealis, Juglans nigella, J. picroides, Spircea andersoni, 

 and identified numerous plants with those described from the Tuiocene 

 of Europe. He described the insect Chrysomelites alaskamis, and Dr. 

 Carol us Mayer described, TJnio onariotis, U. athlios, Pahidina abavia^ 

 and Melania furuhjelmi. 



The Jackson Group, in Louisiana,! consists of marine strata; of lig- 

 uitic beds that tell of swamps; and of nonfossiliferous beds of lamin- 

 ated sands and clays. It spreads over the State north of the Vicks- 

 burg outcrop and west of the Bastrop Hills, The marine strata con- 

 tain massive clays, often full of selenite. At Grand View there is a 

 stratum of such clay 85 feet thick. 



The Vicksburg Group, in Louisiana, consists of smooth, 3'ellow and 

 red clays, with a very small proportion of sand. Limestone no- 

 dules occur, generally, soft and yellow, but sometimes hard and white, 

 and always full of casts of shells. It is exposed from Godwin's shoals 

 to about six miles south of Natchitoches, and from a point below 

 Montgomery to the Washita, below Grand View, but it never occupies 

 an area more than about twelve miles wide. 



In 1870, Dr. Joseph Leid^^J described, from the Fort Bridger Eocene, 

 of Wvoming, Baptemys wyoniingensis, now Dermatemys ivyoming- 

 ensis, Emys stevensonanus, Patriofelis ^dta, Lophiodon modestus, 

 Hyopsodus 2}aulus,JEmys jeansi. E. haydeni, Baena arenosa, Saniva 

 ensidens ; from near the junction of the Big Sandj' and Green 

 rivers, Palceosyops paludosics, Crocodilus elliotti ; from Black's 

 Fork, 3Iicrosus cuspidatus, Notharctus tenebrosus ; from the 

 Tertiary of Colorado, llegacerops coloradoens/s ; from the Tertiary 

 of the Rocky mountain region, Oncobatis pentagonus, Ifylocy- 

 prinus robustus ; from Henry's Fork of Green river, Lophiotheriujn 

 sylvaticum ; from the Miocene in the valle}' of Bridge creek, a tributary 

 of John Daj's river. Oregon, Oreodon superbus, Anchitherium condoni ; 

 from Gav Head, Martha's Vineyard, Qraphiodon vinearius ; from the 



* Flora Fossil is Alaskana. 

 f Geo. of Louisiana, 1870. 

 X Proc. Acad. Nat. Sci. 



