Annual Report of the Geological Survey of Arkansas ..., Volum 4

20 feet abundant Archimedes limestone Arkansas Batesville sandstone Benth black shale Blatchley bluff Boone chert Boonsboro Boston Mountains Butler canadensis center of section chert and cherty cherty limestone coal bank Coal-bearing shale Cove Creek Coville crinoid d'Ailly East Mountain Engelm Evansville exposed exposure Fayetteville shale feet thick flaggy fragments Geological gray shale half of section Harvey hill Illinois River inches Kessler limestone Kessler Mountain layers Lesquereux Little Rock Marshall shale Michx Middle Fork mile Millstone grit Moun Muhl north half northeast northwest quarter Nutt Nuttall occurs outcrop overlain Pentremital limestone plant Prairie Grove Pursh quarter of section ridge road Round Mountain San Francisco Railway sandy section 14 section 27 section 32 section 36 shale and sandstone shaly soil southeast southwest species Spring stone summit thin tion Torr township Vahl valley vicinity virginica Walt Washington county Washington shale West Fork White River Willd