Mesozoic and Cmnozoic Geology and Paloiontology. 65 



In ISoS, Dr. Geo. G. SluimartP described the Cretaceous rocks near 

 the mouth of Delaware Creek, on the Rio Pecos, in New Mexico, where 

 he found a thickness of 960 feet. The first 100 feet consists usually of 

 a hard limestone, of a light cream color and earthy texture, and con- 

 tains numerous spheroidal cavities, from a fourth to a half an inch in 

 diameter, which are sometimes partially filled with loose, ferruginous 

 earth. In other places it is softer and lighter colored, resembling im- 

 pure chalk. Beneath this limestone, deposits of gypsum, clay and 

 sandstone occur. In some places the strata are much disturbed, and 

 are found dipping in opi)Osite directions, at angles of 40° or 50°. He 

 also referred to the Cretaceousf certain strata in the bluffs of the Miss- 

 issippi, above Commerce, Missouri, having a thickness of 158 feet, 

 but no fossils were obtained. 



The Cretaceous rocksj occupy a belt across the State of Alabama, 

 from 50 to 100 miles in width. The counties, either in whole or in 

 part, exposing these rocks on the surface, are Barbour, Russell, Pike, 

 Macon, Montgomery, Butler, Lowndes, Autauga, Wilcox, Dallas, Perry, 

 Marengo, Greene, Choctaw, Sumpter and Pickens. 



T. A. Conrad§ described, from Tippah count}', Mississippi, Phola- 

 dowya tlppana, Periploma appUcata, Sillquaria bipUcata, now Lep- 

 tosolen b/plicatus, Legnmen elliptlcus, L. appressus, Dosinia densaia, 

 Meretrix tippana, now Aphrodina tippana, Papyridea bella, Car- 

 diicm ripleyensG, C. spillmani, C. tippaniim, Opis bella, 0. bicarinaia, 

 TelUna ripleyana, JSTucula percrassa, Cibota lintea, Cuciclloia capax, 

 C. tippana^ now Idonearca tippana, Drcissena tippana^ Pinna laq- 

 uata, Gervillia ens if or mis, Lima acutilineata, Inoceramus argen- 

 teus, I. costellatus, Ostrea covfragosa, 0. j^eculiaris, 0. denticulifera, 

 Exogyra interrupta, Pulvinites argeniea, Anomia setloiformis, Strom- 

 bus densatus, now Pugnellus densatas, Aporrhais decemlirata, now An- 

 chura decemlirata, Harpago tippanus, now Pterocerella tippana, 

 Pimella curvilirata, C'onus canalis, DriUia tippana, D. novemcostata-, 

 Turris ripleyana, Fusus novemliratus, F. bellaliratus; Pyrifusus sub- 

 densatus, Ficiis octoUratus, Rapa suprapUcata, Volutilithes cretacea, 

 now Vulutomorpha cretacea, Chemnitzia distans, C. interrupta, Tri- 

 chotropis cancellaria, Turritella altilis, T. tippana, Lunatia rectila- 

 brum, SoUdulus lintetis, JDulliojJsis cretacea, BacuUtes spillmani, B. 

 tippaensis, Scajjliites iris, and Cytherina tippana. 



Meek and Hayden|| described, from (now the Fox Hills Group) Long 



* Trans. St. Louis Acad. Sci. vol. 1. 



t Proc. Am. Ass. Ad. -Sci. % Geo. of Ala., 1858. 



g Jour, Acad. Nat. Sci., 2d ser. vol. 3. IProc. Acad. Nat. Sci. 



