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Trilobites of the Upper Cambrian Ptychaspid Biomere Wilberns Formation, Central Texas

Published online by Cambridge University Press:  22 December 2017

Susan Ann Longacre
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Abstract

Trilobites collected during the past 20 years from the Morgan Creek, Point Peak, and San Saba Members of the Wilberns Formation comprise 89 species assigned to 45 genera belonging to zones of the upper Franconian and Trempealeauan Stages of the Upper Cambrian Croixan Series. New zonal names are proposed in the interest of a regionally applicable nomenclature. Although none of the zonal nomenclature is identical to that of the 1944 Cambrian Correlation Chart of Howell et al., the four zones recognized in central Texas are equivalent to the eight highest zones on the Chart. Stratigraphically lowest is the Franconian Taenicephalus Zone, with a locally recognized Parabolinoides Subzone at its base; this zone is equivalent to the Conaspis Zone of the Correlation Chart. The Franconian Idahoia Zone, with a locally recognized Idahoia lirae Subzone at its base, is equivalent to the Ptychaspis Subzone of the Ptychaspis-Prosaukia Zone of the Correlation Chart. The sparsely fossiliferous Ellipsocephaloides Zone corresponds to the Prosaukia Subzone of the Ptychaspis-Prosaukia Zone on the Chart. Almost two-thirds of the trilobite species described occur in the Trempealeauan Saukia Zone, which corresponds to the five highest zones of the Correlation Chart; local subzones, in ascending order, are the Saukiella pyrene Subzone, the Saukiella junta Subzone, the Saukiella serotina Subzone, and the Corbinia apopsis Subzone.

The succession of ptychoparioid trilobite faunas within these zones characterizes the Ptychaspid Biomere. The base of the biomere is at the base of the Taenicephalus Zone; the top coincides with the lowest occurrence of an Ordovician trilobite fauna. Trilobite families that characterize the Ptychaspid Biomere are the Ptychaspididae and the Parabolinoididae.

Systematic descriptions include two new subfamilies, Drumaspidinae and Ptychaspidinae, and eight new species, Conaspis leptoholcis, Idiomesus infimus, Euptychaspis frontalis, Keithiella scapane, Saukiella serotina, Prosaukia remora, Calvinella prethoparia, and Westonaspis? texana.

Type
Research Article
Information
Journal of Paleontology , Volume 44 , Issue S4: Paleontological Society Memoir 4. Trilobites of the Upper Cambrian Ptychaspid Biomere Wilberns Formation, Central Texas , January 1970 , pp. 1 - 61
Copyright
Copyright © 1970 Paleontological Society 

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References

References Cited

Alexander, R. H., 1956, Geology of the Leon Creek area, Mason County, Texas; paleontology of the “lower” Wilberns formation: Tex. Univ., unpublished M.A. thesis, 147 p., 3 pls., 19 text-figs., 3 tables, 1 map. Google Scholar
Barnes, V. E., & Bell, W. C., 1954, Cambrian rocks of central Texas, in San Angelo Geological Society, Cambrian [1st] field trip—Llano area [Texas]: San Angelo Geol. Soc. Guidebook, March 19–20, 1954, p. 35–69.Google Scholar
Bass, N. W., & Northrop, S. A., 1953, Dotsero and Manitou formations, White River plateau, Colorado, with special reference to Clinetop algal limestone member of Dotsero formation: Amer. Assoc. Petroleum Geologists Bull., vol. 37, no. 5, p. 889–912, 9 figs. Google Scholar
Bell, W. C., 1950, Stratigraphy: A factor in paleontologic taxonomy: Jour. Paleontology, vol. 24, no. 4, p. 492–496.Google Scholar
Bell, W. C., Berg, R. R., & Nelson, C. A., 1956, Croixan type area—Upper Mississippi Valley, in Australia, América, pt. 2 of Rodgers, J. (ed.), El sistema Cámbrico, su paleogeografía y el problema de su base: Internat. Geol. Cong., 20th, Mexico City, 1956, Symposium, p. 415–446, 1 pl., 4 figs. Google Scholar
Bell, W. C., & Ellinwood, H. L., 1962, Upper Franconian and lower Trempealeauan Cambrian trilobites and brachiopods, Wilberns formation, central Texas: Jour. Paleontology, vol. 36, no. 3, p. 385–423, pls. 51–64, 1 text-fig. Google Scholar
Bell, W. C., Feniak, O. W., & Kurtz, V. E., 1952, Trilobites of the Franconia formation, southeast Minnesota: Jour. Paleontology, vol. 26, no. 2, p. 175–198, pls. 29–38, 1 text-fig. Google Scholar
Berg, R. R., 1953, Franconian trilobites from Minnesota and Wisconsin: Jour. Paleontology, vol. 27, no. 4, p. 553–568, pls. 59–61, 2 text-figs. Google Scholar
Berg, R. R., 1954, Franconia formation of Minnesota and Wisconsin: Geol. Soc. America Bull., vol. 65, no. 9, p. 857–381, 1 pl., 9 text-figs. Google Scholar
Berkey, C. P., 1898, Paleontology, pt. 3 of Geology of the St. Croix Dalles: Amer. Geologist, vol. 21, p. 270–294, pls. 20, 21. (This represents the third of three parts of Berkey's Ph.D. thesis published in The American Geologist. The thesis was accepted by the faculty of the University of Minnesota in June 1897.) Google Scholar
Billings, Elkanah, 1860, On some new species of fossils from the limestone near Point Levis opposite Quebec: Canadian Naturalist, vol. 5, no. 4, p. 301–324.Google Scholar
Billings, Elkanah, 1863, Report of progress from its commencement to 1863 (Geology of Canada) : Canada Geol. Survey, 983 p., 498 figs. Google Scholar
Billings, Elkanah, 1865, Paleozoic fossils: Canada Geol. Survey, vol. 1, 426 p., 401 figs. Google Scholar
Bridge, Josiah, 1931, Geology of the Eminence and Cardareva quadrangles: Mo. Bur. Geology and Mines, vol. 24, 2nd ser., 228 p., 22 pls., 10 figs., 2 maps, with a section by Ulrich, E. O., Trilobita, p. 212–228, pls. 18, 19, 21. (This publication is dated 1930, but according to Knight (1941, p. 403) was issued in 1931.) Google Scholar
Bridge, Josiah, Barnes, V. E., & Cloud, P. E. Jr., 1947, Stratigraphy of the Upper Cambrian, Llano uplift, Texas: Geol. Soc. America Bull., vol. 58, no. 1, p. 109–123, 8 pls. Google Scholar
Clark, T. H., 1924, The paleontology of the Beekmantown series at Levis, Quebec: Bull. Amer. Paleontology, vol. 10, no. 41, 134 p., 9 pls. Google Scholar
Clark, T. H., 1948, Theodenisia, new name, replacing Denisia Clark: Jour. Paleontology, vol. 22, no. 5, p. 643.Google Scholar
Cloud, P. E. Jr., & Barnes, V. E., 1948, The Ellenburger group of central Texas: Tex. Univ., Bur. Econ. Geology Pub. 4621, 473 p., 44 pls. Google Scholar
Dake, C. L., & Bridge, Josiah, 1932, Faunal correlation of the Ellenburger limestone of Texas: Geol. Soc. America Bull., vol. 43, no. 3, p. 725–747, pl. 12, 2 figs. Google Scholar
Decker, C. E., 1945, The Wilberns Upper Cambrian graptolites from Mason, Texas, in Contributions to Geology, 1944: Tex. Univ., Bur. Econ. Geology Pub. 4401, p. 13–61, 10 pls., 4 text-figs. Google Scholar
Ellinwood, H. L., 1953, Late Upper Cambrian and Lower Ordovician faunas of the Wilberns Formation in central Texas: Minn. Univ., unpublished Ph.D. thesis, 241, p., 4 pls., 9 text-figs., 1 table.Google Scholar
Field, R. M., 1915, On the validity of the genus Plethopeltis: Ottawa Naturalist, vol. 29, nos. 3, 4, p. 37–43.Google Scholar
Frederickson, E. A. Jr., 1941, Correlation of Cambro-Ordovician trilobites from Oklahoma: Jour. Paleontology, vol. 15, no. 2, p. 160–163, 1 text-fig. Google Scholar
Frederickson, E. A. Jr., 1948, Upper Cambrian trilobites from Oklahoma: Jour. Paleontology, vol. 22, no. 6, p. 798–803, pl. 123. Google Scholar
Frederickson, E. A. Jr., 1949, Trilobite fauna of the Upper Cambrian Honey Creek formation: Jour. Paleontology, vol. 23, no. 4, p. 341–363, pls. 68–72, 1 text-fig., 1 table. Google Scholar
Grant, R. E., 1962, Trilobite distribution, upper Franconia formation (Upper Cambrian), southeastern Minnesota: Jour. Paleontology, vol. 36. no. 5, p. 965–998, pl. 139, 10 text-figs. Google Scholar
Grant, R. E., 1965, Faunas and stratigraphy of the Snowy Range Formation (Upper Cambrian) in southwestern Montana and northwestern Wyoming: Geol. Soc. America Mem. 96, 171 p., 15 pls., 1 fig. Google Scholar
Hall, James, 1863, Preliminary notice of the fauna of the Potsdam sandstone: N.Y. State Cab. Nat. History, 16th Ann. Rept., p. 119–222, 11 pls. Google Scholar
Hall, James, & Whitfield, R. P., 1877, Paleontology, pt. II of King, Clarence, Report of the geological exploration of the fortieth parallel: Engineer Dept., U.S. Army, vol. 4, p. 199–302, 7 pls. Google Scholar
Harrington, H. J., 1959, General description of Trilobita, in Arthropoda 1, pt. O of Moore, R. C. (ed.), Treatise on invertebrate paleontology: Geol. Soc. America and Univ. Kans. Press, p. 38–117.Google Scholar
Harrington, H. J., Moore, R. C., & Stubblefield, C. J., 1959, Morphological terms applied to Trilobita, in Arthropoda 1, pt. O of Moore, R. C. (ed.), Treatise on invertebrate paleontology: Geol. Soc. America and Univ. Kans. Press, p. 117–126.Google Scholar
Harrington, H. J., et al., 1959, Arthropoda 1, pt. O of Moore, R. C. (ed.), Treatise on invertebrate paleontology: Geol. Soc. America and Univ. Kans. Press, 560 p., 415 figs. Google Scholar
Henningsmoen, Gunnar, 1957, The trilobite family Olenidae; with description of Norwegian material and remarks on the Olenid and Tremadocian series: Norske Vidensk.-Akad. Oslo Mat.-Nat. Klasse, Skr. no. 1, 303 p., 31 pls., 19 text-figs. Google Scholar
Howell, B. F., et al, 1944, Correlation of the Cambrian formations of North America: Geol. Soc. America Bull., vol. 55, no. 8, p. 993–1003, 1 chart. Google Scholar
Jansen, G. C. J., 1957, Cambrian stratigraphy, Goodrich ranch area, Burnet County, Texas: Tex. Univ., unpublished M.A. thesis, 165 p., 5 pls., 6 text-figs., 2 maps, 2 tables. Google Scholar
Knight, J. B., 1941, Paleozoic gastropod genotypes: Geol. Soc. America Spec. Paper 32, 510 p., 96 pls. Google Scholar
Kobayashi, Teiichi, 1935a, The Briscoia fauna of the late Upper Cambrian in Alaska with descriptions of a few Upper Cambrian trilobites from Montana and Nevada: Japanese Jour. Geology and Geography, vol. 12, nos. 3, 4, p. 39–57, pls. 8–10. Google Scholar
Kobayashi, Teiichi, 1935b, Cambrian faunas of south Chosen with a special study on the Cambrian trilobite genera and familia, pt. III of Paleontology, in The Cambro-Ordovician formations and faunas of south Chosen: Tokyo Imp. Univ., Fac. Sci. Jour., sec. 2, vol. 4, pt. 2, p. 49–344.Google Scholar
Lochman, Christina, 1950, Upper Cambrian faunas of the Little Rocky Mountains, Montana: Jour. Paleontology, vol. 24, no. 3, p. 322–349, pls. 46–51. Google Scholar
Lochman, Christina, 1953, Analysis and discussion of nine Cambrian trilobite families: Jour. Paleontology, vol. 27, no. 6, p. 889–896, 1 text-fig. Google Scholar
Lochman, Christina, 1956, The evolution of some Upper Cambrian and Lower Ordovician trilobite families: Jour. Paleontology, vol. 30, no. 3, p. 445–462, 7 text-figs. Google Scholar
Lochman, Christina, 1964a, Upper Cambrian faunas from the subsurface Deadwood Formation, Williston Basin, Montana: Jour. Paleontology, vol. 38, no. 1, p. 33–60, pls. 9–15, 1 text-fig. Google Scholar
Lochman, Christina, 1964b, Basal Ordovician faunas from the Williston Basin, Montana: Jour. Paleontology, vol. 38, no. 3, p. 453–476, pls. 63–67. Google Scholar
Lochman, Christina, & Hu, Chung-Hung, 1959, A Ptychaspis faunule from the Bear River Range, southeastern Idaho: Jour. Paleontology, vol. 33, no. 3, p. 404–427, pls. 57–60. Google Scholar
Lochman, Christina, & Hu, Chung-Hung, 1960, Upper Cambrian faunas from the northwest Wind River Mountains, Wyoming, Part I: Jour. Paleontology, vol. 34, no. 5, p. 793–834, pls. 95–100, 4 text-figs. Google Scholar
Miller, B. M., 1936, Cambrian trilobites from northwestern Wyoming: Jour. Paleontology, vol. 10, no. 1, p. 23–34, pl. 8. Google Scholar
Moore, R. C., 1955, Invertebrates and geologic time scale, in Poldervaart, Arie (ed.), Crust of the earth—A symposium: Geol. Soc. America Spec. Paper 62, p. 547–573, 13 figs. Google Scholar
Nelson, C. A., 1951, Cambrian trilobites from the St. Croix valley [Minn.-Wis.]: Jour. Paleontology, vol. 25, no. 6, p. 765–784, pls. 106–110. Google Scholar
Nelson, C. A., 1956, Upper Croixan stratigraphy, Upper Mississippi Valley: Geol. Soc. America Bull., vol. 67, no. 2, p. 165–183, 10 figs. Google Scholar
Owen, D. D., 1852, Report of the geological survey of Wisconsin, Iowa, and Minnesota: Philadelphia, Lippencott, Grambo and Co., 638 p., 71 figs., 27 pls., 20 maps. Google Scholar
Palmer, A. R., 1955a, The faunas of the Riley formation in central Texas: Jour. Paleontology, vol. 28, no. 6, p. 709–786, pls. 76–92, 6 text-figs. (Because of a printers' strike, this issue, dated 1954, was not mailed until January 15, 1955.) Google Scholar
Palmer, A. R., 1955b, Upper Cambrian Agnostidae of the Eureka district, Nevada: Jour. Paleontology, vol. 29, no. 1, p. 86–101, pls. 19–20, 2 text-figs. Google Scholar
Palmer, A. R., 1962, Glyptagnostus and associated trilobites in the United States: U.S. Geol. Survey Prof. Paper 374-F, 49 p., 6 pls., 14 text-figs., 1 table. Google Scholar
Palmer, A. R., 1965a, Biomere—A new kind of biostratigraphic unit: Jour. Paleontology, vol. 39, no. 1, p. 149–153, 2 text-figs. Google Scholar
Palmer, A. R., 1965b, Trilobites of the Late Cambrian Pterocephaliid biomere in the Great Basin, United States: U.S. Geol. Survey Prof. Paper 493, 105 p., 23 pls., 16 text-figs. Google Scholar
Palmer, A. R., 1968, Cambrian trilobites of east-central Alaska: U.S. Geol. Survey Prof. Paper 559-B, 115 p., 13 pls., 6 text-figs. Google Scholar
Raasch, G. O., 1939, Cambrian Merostomata: Geol. Soc. America Spec. Paper 19, 146 p., 21 pls., 14 text-figs. Google Scholar
Raasch, G. O., 1951, Revision of Croixan dikelocephalids: Ill. State Acad. Sci. Trans., vol. 44, p. 137–151 (Reprinted, 1952, as Ill. State Geol. Survey Circ. 179, p. 137–151.) Google Scholar
Rasetti, Franco, 1944, Upper Cambrian trilobites from the Lévis conglomerate: Jour. Paleontology, vol. 18, no. 3, p. 229–258, pls. 36–39. Google Scholar
Rasetti, Franco, 1945a, Description supplémentaire de trois genres de trilobites cambriens: Naturaliste Canadien, vol. 72, nos. 5, 6, p. 117–124, pl. 1. Google Scholar
Rasetti, Franco, 1945b, New Upper Cambrian trilobites from the Lévis conglomerate: Jour. Paleontology, vol. 19, no. 5, p. 462–478, pl. 60–62. Corrections, 1946, vol. 20, no. 1, p. 88.Google Scholar
Rasetti, Franco, 1946, Revision of some late Upper Cambrian trilobites from New York, Vermont, and Quebec: Amer. Jour. Sci., vol. 244, no. 8, p. 537–546, pl. 1. Google Scholar
Rasetti, Franco, 1954a, Early Ordovician trilobite faunules from Quebec and Newfoundland: Jour. Paleontology, vol. 28, no. 5, p. 581–587, pls. 60–61, 3 text-figs. Google Scholar
Rasetti, Franco, 1954b, Phylogeny of the Cambrian trilobite family Catillicephalidae and the ontogeny of Welleraspis: Jour. Paleontology, vol. 28, no. 5, p. 599–612, pl. 62, 4 text-figs. Google Scholar
Rasetti, Franco, 1959, Trempealeauian (sic.) trilobites from the Conococheague, Frederick, and Grove limestones of the central Appalachians: Jour. Paleontology, vol. 33, no. 3, p. 375–398, pls. 51–55, 2 text-figs. Google Scholar
Rasetti, Franco, 1963, Additions to the Upper Cambrian fauna from the conglomerate boulders at Lévis, Quebec: Jour. Paleontology, vol. 37, no. 5, p. 1009–1017, pls. 129, 130, 1 text-fig. Google Scholar
Raymond, P. E., 1913, A revision of the species which have been referred to the genus Bathyurus: Canada Geol. Survey, Victoria Mem. Mus. Bull. 1, p. 51–69.Google Scholar
Raymond, P. E., 1924, New Upper Cambrian and Lower Ordovician trilobites from Vermont: Boston Soc. Nat. History, Proc., vol. 37, no. 4, p. 389–466, pls. 12–14. Google Scholar
Raymond, P. E., 1937, Upper Cambrian and Lower Ordovician Trilobita and Ostracoda from Vermont: Geol. Soc. America Bull., vol. 48, p. 1079–1146, pls. 1–4. Google Scholar
Resser, C. E., 1935, Nomenclature of some Cambrian trilobites: Smithsonian Misc. Coll. Pub. 3295, vol. 93, no. 5, 46 p.Google Scholar
Resser, C. E., 1937, Third contribution to nomenclature of Cambrian trilobites: Smithsonian Misc. Coll. Pub. 3408, vol. 95, no. 22, 29 p.Google Scholar
Resser, C. E., 1938, Fourth contribution to nomenclature of Cambrian fossils: Smithsonian Misc. Coll. Pub. 3487, vol. 97, no. 10, 43 p.Google Scholar
Resser, C. E., 1942a, Fifth contribution to nomenclature of Cambrian fossils: Smithsonian Misc. Coll. Pub. 3682, vol. 101, no. 15, 58 p.Google Scholar
Resser, C. E., 1942b, New Upper Cambrian trilobites: Smithsonian Misc. Coll. Pub. 3693, vol. 103, no. 5, 136 p., 21 pls. Google Scholar
Shaw, A. B., 1954, Correlation of the Paleozoic formations of Wyoming, in Guidebook—Ninth annual field conference, Casper area, Wyoming: Wyo. Geol. Assoc., Guidebook, chart 2 in pocket.Google Scholar
Shaw, A. B., & Deland, C. R., 1955, Cambrian of southwestern Wyoming, in 10th annual field conference, Green River Basin: Wyo. Geol. Assoc., Guidebook, p. 38–42, figs. 1, 2. Google Scholar
Stitt, J. H., in press, Late Cambrian and earliest Ordovician trilobites, Timbered Hills and lower Arbuckle Groups, western Arbuckle Mountains, Murray County, Oklahoma: Okla. Geol. Survey Bull. Google Scholar
Twenhofel, W. H., Raasch, G. O., & Thwaites, F. T., 1935, Cambrian strata of Wisconsin: Geol. Soc America Bull., vol. 46, no. 11, p. 1687–1744, 1 pl., 1 text-fig. CrossRefGoogle Scholar
Ulrich, E. O., & Resser, C. E., 1930, Dikelocephalinae and Osceolinae, pt. I of Trilobita, in The Cambrian of the upper Mississippi Valley: Milwaukee Public Mus. Bull., vol. 12, no. 1, p. 1–122, 23 pls. Google Scholar
Ulrich, E. O., & Resser, C. E., 1933, Saukiinae, pt. II of Trilobita, in The Cambrian of the upper Mississippi Valley: Milwaukee Public Mus. Bull., vol. 12, no. 2, p. 123–306, pl. 24–45. Google Scholar
Walcott, C. D., 1879, Descriptions of new species of fossils from the Calciferous formation: N.Y. State Mus. Nat. History, 32nd Ann. Rept., p. 129–131.Google Scholar
Walcott, C. D., 1884, Paleontology of the Eureka district [Nevada]: U.S. Geol. Survey Mon. 8, 298 p., 24 pls., 7 text-figs. Google Scholar
Walcott, C. D., 1886, Second contribution to the studies on the Cambrian faunas of North America: U.S. Geol. Survey Bull, vol. 30, 369 p., 33 pls., 10 text-figs. Google Scholar
Walcott, C. D., 1890, Description of new forms of Upper Cambrian fossils: U.S. Natl. Mus. Proc., vol. 13, no. 820, p. 267–279, pls. 20, 21. Google Scholar
Walcott, C. D., 1899, Cambrian fossils, in Geology of the Yellowstone National Park: U.S. Geol. Survey Mon. 32, pt. 2, p. 440–478, pls. 60–65. Google Scholar
Walcott, C. D., 1912, New York Potsdam-Hoyt fauna: Smithsonian Misc. Coll. Pub. 2136, vol. 57, no. 9, p. 251–304, pls. 37–49. Google Scholar
Walcott, C. D., 1914, Dikelocephalus and other genera of the Dikelocephalinae: Smithsonian Misc. Coll. Pub. 2187, vol. 57, no. 13, p. 345–412, pls. 60–70. Google Scholar
Walcott, C. D., 1916, Cambrian trilobites: Smithsonian Misc. Coll. Pub. 2370, vol. 64, no. 3, p. 157–258, pls. 24–38. Google Scholar
Walcott, C. D., 1924a, Geological formations of Beaverfoot-Brisco-Stanford Range, British Columbia, Canada, no. 1 of Cambrian geology and paleontology, V: Smithsonian Misc. Coll. Pub. 2756, vol. 75, no. 1, p. 1–51, 8 pls., 11 text-figs. Google Scholar
Walcott, C. D., 1924b, Cambrian and lower Ozarkian trilobites, no. 2 of Cambrian geology and paleontology, V: Smithsonian Misc. Coll. Pub. 2788, vol. 75, no. 2, p. 53–60, pl. 9–14. Google Scholar
Walcott, C. D., 1925, Cambrian and Ozarkian trilobites, no. 3 of Cambrian geology and paleontology, V: Smithsonian Misc. Coll. Pub. 2823, vol. 75, no. 3, p. 61–146, pls. 15–24, text-figs. 12, 13. Google Scholar
Weller, Stuart, 1903, The Paleozoic faunas: N.J. Geol. Survey, Rept. Paleontology, vol. 3, 462 p., 53 pls. Google Scholar
Whitfield, R. P., 1878, Preliminary descriptions of new species of fossils from the lower geological formations of Wisconsin: Wisc. Geol. Survey, 1877 Ann. Rept., p. 50–89.Google Scholar
Whitfield, R. P., 1880, Descriptions of new species of fossils from the Paleozoic formations of Wisconsin: Wisc. Geol. Survey, 1879 Ann. Rept., p. 44–71.Google Scholar
Whitfield, R. P., 1882, Species from the Potsdam sandstone, pt. 3 of Paleontology: Wisc. Geol. Survey, 1873–1879 Ann. Rept., vol. 4, p. 163–363, 27 pls. Google Scholar
Wilson, J. L., 1951, Franconian trilobites of the central Appalachians: Jour. Paleontology, vol. 25, no 5, p. 617–654, pls. 89–95, 1 text-fig. Google Scholar
Winston, Don, 1957, Geology of the Leon Creek area, Mason County, Texas; paleontology of the upper Wilberns Formation: Tex. Univ., unpublished M.A. thesis, 156 p., 4 pls., 8 text-figs, 1 map. Google Scholar
Winston, Don, & Nicholls, Harry, 1967, Late Cambrian and Early Ordovician faunas from the Wilberns Formation of central Texas: Jour. Paleontology, vol. 41, no. 1, p. 66–96, pl. 9–13, 4 text-figs. Google Scholar
Wise, J. C., 1964, Cambrian stratigraphy of the Sandy Post Office area, Blanco County, Texas: Tex. Univ., unpublished M.A. thesis, 213 p., 10 pls., 1 text-fig, 1 map, 1 table. Google Scholar