48 SPECIES OF EXOGYEA FEOM THE EASTERN GULF EEGION AND THE CAEOLINAS. 



In New Jersey the species occurs in the Marshalltown clay marl of the Matawan group. 



In Arkansas and northeastern Texas the species occurs abundantly in the Brownstown 

 marl. 



In Texas the species is abundant in places in the upper part of the Austin chalk and in 

 the lower part of the overlying Taylor marl; it is also fairly abundant in places in the Anacacho 

 formation, which is the time equivalent in southwestern Texas of part or all of the Taylor marl. 



Specimens considered referable to this species have been obtained from two localities out- 

 side of the Atlantic and Gulf Coastal Plain. One of the localities is represented by a specimen 

 in the National Museum labeled as follows: "U. S. G. S. loc. No. 622, across the Rio Grande 

 from Presidio, Tex., near top of shales. Collected by C. A. White and T. W. Stanton." Stanton 1 

 compares the horizon where this was found with that of the invertebrate-bearing beds near San 

 Carlos, Presidio County, Tex., which he regards as synchronous with a part of the Taylor marl. 



The second locality is represented by several specimens, referred to this species by 

 White, 2 which were obtained "east of Impracticable Ridge, Utah," from beds now known to 

 belong to the Colorado group. The figured specimen is in the National Museum (U. S. Nat. Mus. 

 Cat. No. 13417) and has been examined by the writer. It is not a typical representative of 

 the species, but is nearer to it than to any other described species. Until more specimens have 

 been obtained from this locality and then variations noted, it is, perhaps, best to regard it as 

 referable to this species. 



Localities. — In the eastern Gulf region the species has been collected from 64 localities dis- 

 tributed along a belt 10 to 20 miles in width , extending from Chattahoochee County, Ga., through 

 Alabama and Mississippi to McNairy County, Tenn. The trend of this belt may be seen by 

 referring to the map (PI. IX); the area embraced by the belt is included between the dotted 

 line indicated by the red letter P and the red line 2. Detailed descriptions of all the localities 

 accompany the tables (pp. 24-25). Some of the more typical localities are the following: 



U. S. Geol. Survey coll. 5379. — Seaboard Air Line Railway. 2| miles northwest of Cusseta. Chattahoochee County, 

 Ga. Torobigbee sand member of Eutaw forniati< m . 



U. S. Geol. Survey coll. 538S. — Big Bend. Chattahoochee River. 24J miles below Columbus, on the Alabama side 

 uf the river. Tombigbee sand member of Eutaw formation. 



U. S. Geol. Survey coll. 6406. — Banks Landing, Chattahoochee River. 26i miles below Columbus, in Chattahoo- 

 chee County, Ga. Tombigbee sand member of Eutaw formation. 



U. S. Geol. Survey colls. S44. 5392. 6405.— Blufftown. Chattahoochee River, 314; miles below Columbus, in Chatta- 

 hoochee County. Ga. Tombigbee sand member of Eutaw formation. 



U. S. Geol. Survey coll. 6S27. — Cut of Central of Georgia Railway 5 miles southwest of Seale, Russell County. Ala. 

 Tombigbee sand member of Eutaw formation. 



U. S. Geol. Survey coll. 6S20. — Conecuh Falls. Union Springs. Bullock County. Ala. Ripley formation near top of 

 Exogyra ponderosa zone. 



U. S. Geol. Survey .oils. 273. 6425a. — Choctaw Bluff, Warrior River. 4 miles south of Eutaw, Greene County, Ala. 

 Top of Tombigbee sand member of Eutaw formation. 



TJ. S. Geol. Survey coll. 0432. — Warrior River. Hatchs Bluff. 7i miles above Deruopolis (by the river), in Hale 

 County, Ala. Selma chalk (near top of Exogyra ponderosa zone). 



TJ. S. Geol. Survey colls. 282. 6451a-*, H414. 6918.— Plymouth Bluff. Tombigbee River, 4 to 5 miles northwest of 

 Columbus, Lowndes County, Miss. Tombigbee sand member of Eutaw formation. 



U. S. Geol. Survey coll. OSsO. — Allen Gavin place, 12 miles east of Brookville. Noxubee County. Miss. Selma 

 chalk (near base). 



U. S. Geol. Survey coll. 6925. — Bluff on Tombigbee River at Aberdeen, Monroe County. Miss. Tombigbee sand 

 member of Eutaw formation 



U. S. Geol, Survey colls. i^NMiSSS.— One mile west of Cotton Gin Port. Monroe County, Miss. Top of Tombigbee 

 sand member of Eutaw formation and base of Selma chalk. 



V. S. Geol. Survey coll. 6S92.— Gullies on Erskine Miller's place near Black Oak Grove church, 7 miles northeast 

 of Okolona in Monroe County. Miss. Selma chalk. Exogyra ponderosa zone. 



U. S. Geol. Survey colls. 645S6. 6911. — Hare's old mill site i in Big Brown Creek. 9 miles east of Booneville. Prentiss 

 County, Miss. Tombigbee sand member of Eutaw formation. (Probably corresponds approximately to Mortoniceras 

 sub zone.} 



i Bull. U. S. Geol. Survey Xo. 1M, 1900, p. 82. 



'White, C. A., Kept. U. S. Geog. Surreys W. 100th Mer., vol. 4, pt. 1, 1877, p. 172, PI. XIV, figs. 1 a-c. 



