Late Cambrian microbial build-ups, Llano Area, Central Texas: A three-phase morphological evolution

Pankaj Khanna, Heath H. Hopson, André W. Droxler, Dylan A. Droxler, Daniel Lehrmann, Brian Kubik, Jacob Proctor, Pulkit Singh, Paul M. Harris

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Although Late Cambrian microbial build-ups were recognized in the Point Peak Member of the Wilberns Formation in Central Texas (USA) nearly 70 years ago, only a few studies focused specifically on the build-ups themselves. This study focuses on the interpretation of the regional (15 measured sections described in literature representing an area of 8000 km2) and local (field and drone photogrammetry studies in a 25 km2 area from within south Mason County) microbial build-up occurrence, describes their growth phases and details their interactions with the surrounding inter-build-up sediments. The study establishes the occurrence of microbial build-ups in the lower and upper Point Peak members (the Point Peak Member is informally broken up into the lower Point Peak and the upper Point Peak members separated by Plectotrophia zone). The lower Point Peak Member consists of three
Original languageEnglish (US)
Pages (from-to)1135-1160
Number of pages26
Issue number2
StatePublished - Dec 2 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This research was a part of the Rice/Trinity Industry Microbial Consortium (funded by Shell, Statoil, Chevron and ConocoPhillips). Part of this research was possible because of newly accessible outcrops on private lands. We are grateful to the owners Mr and Mrs Don and Rosie Shepard and caretakers Mr and Mrs Mark and Priscilla Krauss of Eagle Ridge Ranch, and Mr and Mrs Gene and Patsy Zesch, Mr Scott Zesch for allowing us to conduct research on their ranches. We would also like to thank the reviewers, whose critical comments has helped us drastically improve this manuscript as well as Dr Jeff Dravis for his comments and suggestions throughout the research project.


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