NO. 6 OYSTERS OF THE LOPHA LUGUBRIS GROUP — KAUFFMAN 73 



13. U.S.G.S. 4456 — Benton (Subgroup: Juana Lopez equivalent ?), horizon 



No. 2 (J. H. Gardner: unpublished), about 60 feet below main massive 

 sandstone of Coloradoan age, 5 miles below Arnold's store, 10 miles 

 northeast of Gallup, N. Mex. Collected by J. H. Gardner, 1907. 



14. U.S.G.S. 6516 — Upper part of the Benton (Subgroup: Juana Lopez 



equivalent), 150 to 200 feet above the Greenhorn Limestone, branch of 

 Vermejo Creek, about 12 miles northwest of Vermejo Park Post Office, 

 N. Mex. Collected by T. W. Stanton, 1910. 



15. U.S.G.S. 7539 — Eagle Ford Shale, layer No. 1, quarry of the Texas 



Portland Cement Co., 2.5 miles due east of Eagle Ford, Dallas County, 

 and 3 miles west of Trinity River at Dallas, Tex. Collected by L. W. 

 Stephenson, 1911. 



16. U.S.G.S. 7579 — Basal bed of the Austin Chalk, on Walnut Creek, about 



1 mile east of Waiters' Station, Travis County, Tex. Collected by 

 L. W. Stephenson, 1911. 



17. U.S.G.S. 7993 — Colorado (Group: Juana Lopez equivalent), in 50 feet of 



yellow calcareous shaly sandstone, zone of Prionocyclus Wyoming ensis 

 and Scaphites warreni, about 3.5 miles south of Casa Salazar, Mt. 

 Taylor Quad., N. Mex, Collected by W. T. Lee and T. W. Stanton, 

 1912. 



18. U.S.G.S. 9250— Mancos Shale, 300 to 400 feet above the base, near Delta, 



Colo. Collected by G. H. Stone, 1915. 



19. U.S.G.S. 10368 — Colorado (Group: Juana Lopez equivalent ?), 14 miles 



S. 20° W. from Shiprock Mt. (Wilson Peak), sec. 5 or 8, T. 9 N., 

 R. 4 W., Navajo Meridian, near the base of Beautiful Mt., San Juan 

 Basin, N. Mex. Collected by W. E. Bryant, Dobbin, and J. B. Reeside, 

 Jr., 1920. 



20. U.S.G.S. 10506 — Mancos Shale, 300 feet above Dakota Sandstone, 



Scaphites zone (Juana Lopez equivalent), 1.5 miles west of Durango, 

 NWl/4 SEl/4 sec. 18, T. 35 N., R. 9 W., Ignacio Quad,, Colo, Col- 

 lected by J. B. Reeside, Jr., 1920. 



21. U,S.G.S. 12883 — Reworked Eagle Ford Shale zone in the base of the 



Austin Chalk, exposures in bank of creek east of railroad, south of 

 Colorado River, south of Austin, Travis County, Tex. Collected by 

 L. W. Stephenson, 1924. 



22. U.S.G.S. 13663 — (Juana Lopez equivalent), 2 miles north of Whitewater, 



Grand Junction region, Colo. Collected by J. B. Reeside, Jr., 1926. 



23. U.S.G.S. 14691— "Blue Hills Shale" (Carlile Shale, questionably from 



pockets of Juana Lopez Limestone at top of so-called Blue Hill Shale of 

 older authors), Lopha lugtibris zone, near Beloit, Kans. Collected by 

 by J. B. Reeside, Jr., 1929. 



24. U.S.G.S, 15923 — Mancos Shale, 348 feet below Gallup Sandstone (Juana 



Lopez equivalent ?), triangulation point, Gallup, approximately center 

 of sec. 12, T. 14 N., R. 2 W., southern San Juan Basin, N. Mex. 

 Collected by C. B. Hunt and party, 1931. 



25. U.S.G.S, 18876 — "Codell ? Sandstone" (Juana Lopez Member at top of 



Codell), thin beds 30 feet below highly fossiliferous zone (of Mancos 

 Shale), on Biltabito Road, 15 miles west of junction with highway to 

 Gallup, 15 miles west of Shiprock bridge, San Juan County, N. Mex. 

 Collected by N. W. Bass, 1943, 



