Proterozoic Paleozoic Cambrian Ordovician Silurian Devonian

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Proterozoic Paleozoic Cambrian Ordovician Silurian Devonian

Approximate location of Burley No. 1 well Seismic Stratigraphic Extensional and Thrust Age West Formation or Group Name East Lithology Packages Orogenic Events Sheets Perm. Lower Upper Post-Pottsville rocks, undivided Pottsville Group and Middle post-Pottsville rocks Alleghanian orogeny Penn. Lower Pottsville Group Upper Greenbrier Limestone and Mauch Chunk Group Greenbrier Limestone Miss. Lower Berea Sandstone, Sunbury Shale, and Price Formation Venango Group Venango Group (Formation) Hampshire Formation and Riceville Formation Chagrin Shale Bradford Group Bradford Group Huron Mbr. of Greenland Gap Group the Ohio Shale Upper Salina sheet Acadian orogeny Java Formation Angola Shale Member Devonian West Falls Elk Group Formation Rhinestreet Shale Member Brallier Formation Elk Group Sonyea Formation Genesee Formation Harrell Shale Middle Tully Limestone, Hamilton Group, Marcellus Shale, and Onondaga Limestone Hamilton Group Lower Oriskany Sandstone and Helderberg Group Upper Salina Group (includes salt beds) Salina Group, Tonoloway Limestone, and Wills Creek Formation and Wills Creek Formation Salina Group Paleozoic Lockport Dolomite and Keefer Sandstone McKenzie Limestone and Keefer Sandstone Silurian Rose Hill Formation Lower Reedsville- Tuscarora Sandstone Taconic orogeny Martinsburg Juniata Formation Juniata Formation sheet Oswego Sandstone Upper Reedsville Shale (Utica Shale at base) Reedsville Shale Trenton Limestone Trenton Limestone Black River Limestone Middle Ordovician Knox unconformity Beekmantown Group Beekmantown Group ? Passive continental Lower Rome- margin modified Waynesboro Upper sandstone member of the Copper Ridge Dolomite of the Knox Group by Rome trough sheet Upper extension Copper Ridge Dolomite of the Knox Group Knox Group and Middle pre-Knox rocks Conasauga Group and Rome Formation Cambrian Lower Autochthonous Grenvillian basement Grenvillian Grenvillian basement basement Proterozoic Figure 3.--Correlation chart of Paleozoic and Proterozoic rocks in the study area and associated thrust sheets. Also shown are times of major extensional and orogenic events. Colors refer to seismic stratigraphic packages that are defined in figure 5 and interpreted on the seismic sections..

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Church 18.Pdf (1.785Mb)
Paleontological Contributions Number 18 Efficient Ornamentation in Ordovician Anthaspidellid Sponges Stephen B. Church August 9, 2017 Lawrence, Kansas, USA ISSN 1946-0279 (online) paleo.ku.edu/contributions Ridge-and-trough ornamented outer-wall fragment of the Ordovician anthaspidellid sponge Rugocoelia eganensis Johns, 1994. Paleontological Contributions August 9, 2017 Number 18 EFFICIENT ORNAMENTATION IN ORDOVICIAN ANTHASPIDELLID SPONGES Stephen B. Church Department of Geological Sciences, Brigham Young University, Provo, Utah 84602-3300, [email protected] ABSTRACT Lithistid orchoclad sponges within the family Anthaspidellidae Ulrich in Miller, 1889 include several genera that added ornate features to their outer-wall surfaces during Early Ordovician sponge radiation. Ornamented anthaspidellid sponges commonly constructed annulated or irregularly to regularly spaced transverse ridge-and-trough features on their outer-wall surfaces without proportionately increasing the size of their internal wall or gastral surfaces. This efficient technique of modi- fying only the sponge’s outer surface without enlarging its entire skeletal frame conserved the sponge’s constructional energy while increasing outer-wall surface-to-fluid exposure for greater intake of nutrient bearing currents. Sponges with widely spaced ridge-and-trough ornament dimensions predominated in high-energy settings. Widely spaced ridges and troughs may have given the sponge hydrodynamic benefits in high wave force settings. Ornamented sponges with narrowly spaced ridge-and- trough dimensions are found in high energy paleoenvironments but also occupied moderate to low-energy settings, where their surface-to-fluid exposure per unit area exceeded that of sponges with widely spaced surface ornamentations. Keywords: lithistid sponges, Ordovician radiation, morphological variation, theoretical morphology INTRODUCTION assumed by most anthaspidellids.
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Cambrian Ordovician
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