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Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in South-Central New Mexico

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Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in South-Central New Mexico Graduate Theses, Dissertations, and Problem Reports 2011 Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in south-central New Mexico Elizabeth C. Rhenberg West Virginia University Follow this and additional works at: https://researchrepository.wvu.edu/etd Recommended Citation Rhenberg, Elizabeth C., "Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in south-central New Mexico" (2011). Graduate Theses, Dissertations, and Problem Reports. 3414. https://researchrepository.wvu.edu/etd/3414 This Dissertation is protected by copyright and/or related rights. It has been brought to you by the The Research Repository @ WVU with permission from the rights-holder(s). You are free to use this Dissertation in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you must obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/ or on the work itself. This Dissertation has been accepted for inclusion in WVU Graduate Theses, Dissertations, and Problem Reports collection by an authorized administrator of The Research Repository @ WVU. For more information, please contact [email protected]. Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in south-central New Mexico Elizabeth C. Rhenberg Dissertation submitted to the Eberly College of Arts and Sciences at West Virginia University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Geology Thomas Kammer, Ph.D., Chair William Ausich, Ph.D. Timothy Carr, Ph.D. Helen Lang, Ph.D. Richard Smosna, Ph.D. Department of Geology and Geography Morgantown, West Virginia 2011 Keywords: Lake Valley Formation, Phylogenetics, Camerate Crinoids, Early Osagean Copyright 2011 Elizabeth C. Rhenberg ABSTRACT Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in south-central New Mexico Elizabeth C. Rhenberg The Lake Valley Formation has long been known for the crinoids that are abundant in the formation. The crinoids were noted in the first descriptions of the formations in the late 1800’s, but there has never been a comprehensive study done on the crinoids and as a result there is no complete list of crinoids that existed in south-central New Mexico during the Early Mississippian. Although all subclasses of crinoids are found in the Nunn Member, it is the camerate crinoids that dominate the fauna and will be the focus of this study. Most of the specimens studied came from the Macurda collection from the University of Michigan. This collection was supplemented with specimens from the Laudon collection from the University of New Mexico and additional samples collected in the field. These collections provided more than 7000 specimens to be examined, with approximately 4500 of those being identifiable camerate crinoids. The first chapter of this paper is a systematic review of the camerates. Sixty-one species are recorded from the Nunn Member, five of which are new species: Blairocrinus macurdai, Iotacrinus novamexicana, Agaricocrinus alamogordoensis, Uperocrinus kuesi, and Collicrinus laudoni. An updated list of camerates found in the Lake Valley allows for better understanding and easier comparison of crinoid faunas across North America during this time. Environmental preferences were also examined to see if there was a difference between the faunas found in the shallow water shelf and those found associated with Waulsortian mounds in deeper water. The majority of the camerates found in the Lake Valley Formation are from the Family Actinocrinitidae. This family has been a source of much taxonomic confusion due to generic concepts not equally applied between Europe in North America. The second chapter of this paper objectively defines the actinocrinitids by discrete characters and reevaluates the generic assignments of North American species. A phylogenetic hypothesis is presented for the relationships of the Actinocrinitidae genera based on a parsimony-based analysis and plotted against stratigraphic ranges. Although groupings were revealed in this analysis, the Actinocrinitidae cannot be readily divided into subfamilies. Twenty-one genera of Actinocrinitidae are described, 17 of which are found in North America. A total of 125 species were evaluated of which 34 species and one open-nomenclature taxon are reassigned to different genera, and four species are designated as nomina dubia. The third chapter evaluates the similarities of camerate genera in three coeval North American formations with the Lake Valley Formation. These formations are the lower Burlington Limestone of the Mississippi Valley, the Redwall Limestone of Arizona, and the Anchor Limestone of Nevada. These similarities are based on presence-absence data with the Jaccard Coefficient and with rarefaction curves. The lower Burlington and Lake Valley faunas are nearly equal in generic richness (35 and 31 respectively) and have a high similarity (0.61). The Redwall and Anchor limestones have approximately half the number of genera that the lower Burlington and Lake Valley formations have and are very dissimilar to each other (0.18). The disparity in number of genera in the Redwall and Anchor limestones as compared to the lower Burlington and Lake Valley are likely taphonomic. The camerates of the Redwall are poorly preserved, likely due to early diagenesis of chert and dolomite. In the Anchor, the camerates were likely moved in debris flows from shallow water settings, diminishing their preservation potential. Because neither the Redwall nor the Anchor have significant numbers of unique genera and both have genera that are a subset of the lower Burlington fauna, the seas of North America were likely well connected during the Early Mississippian, allowing for the camerates to widely disperse. Rarefaction curves indicate that the Redwall and Anchor limestones have been incompletely sampled. Thus, poor preservation and limited sampling in these formations have produced an apparently endemic pattern for faunas that were originally cosmopolitan. iv PREFACE – A Note on Organization The following doctoral dissertation was completed in the form of three articles ready for submission to peer-reviewed journals. Because of this format, there is some repetition of general information and the figures and tables are found at the end of the each chapter. The papers are treated as separate chapters. The first chapter is a systematic review of the camerates of the Nunn Member. The second chapter is a review of the genera within the Family Actinocrinitidae and a phylogenetic analysis of the family. The third chapter is a biogeographic comparison of camerate crinoids of the Nunn Member to three coeval formations: the lower Burlington of Iowa, the Redwall Limestone of Arizona, and the Anchor Limestone of Nevada. v ACKNOWLEDGMENTS This research was supported by grants from the Eberly College of Arts and Sciences, the Department of Geology and Geography at West Virginia University, and the Shumaker Fund. Most of the material studied was collected by Dr. Brad Macurda during the 1960s and 70s while he was at the University of Michigan. I thank Dr. Macurda for providing his collection for my study. Dr. Barry Kues of the University of New Mexico provided helpful assistance in the field guiding us to various sites where the Lake Valley Formation outcrops in New Mexico and in allowing us to borrow from the Laudon collection. Dr. William Ausich of the Ohio State University provided a constructive review on the second chapter as well as helpful information throughout the writing of the first two chapters. I would lastly like to thank Dr. Thomas Kammer, my Ph.D. adviser, for the help and advice that he provided throughout the identification of crinoids and the writing process. He made a significant contribution to this research with his seemingly endless knowledge on crinoids. vi TABLE OF CONTENTS Abstract ..................................................................................................................................... ii Preface...................................................................................................................................... iv Acknowledgements ....................................................................................................................v Chapter 1: Systematic review of camerate crinoids of the lower Mississippian Lake Valley Formation (Nunn Member, Osagean), New Mexico .................................................................1 Abstract ..........................................................................................................................1 Introduction ....................................................................................................................2 Locality and Stratigraphy ...............................................................................................3 Faunal Analysis ..............................................................................................................4 Systematic Paleontology ................................................................................................7 Family Rhodocrinitidae .....................................................................................9
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