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5th septa abrupt increase Abrupt Septal pores abundant Alveoli Tunnel Angles Anatase apatite Arroyo formation average Bairdia basal Beede samples Belle Plains Callahan County Chert Chomata last Alveoli clays Coarse Coke County Coleman County color conglomerate Creek cross section Diameter Abrupt Septal Diameter Ratio Number Dothan east of Baird Epidote feldspar fifth whorl fossil Fusulinae garnets Genus grains Green County Group heavy minerals hematite horl idth of vhorls illustrates increase first noted Indistinct initial chamber itudinal section last Alveoli Tunnel last whorl limestone longitudinal section mile southeast miles east Palo Pinto Pecos County Pennsylvanian Plate VII present regular 5th rounder roundest roup Runnels County rutile sample number San Angelo sands sandstone Schwagerinae sediments Septa in Thickness sericite shale Slide number southeast Runnels County specimens Talpa beds Thickness observed Thickness of walls tourmaline Triassic Tunnel Angles Septa upper Clyde vail volutions 3rd,5th wall is regular whorl width Zircon