Arkansas novaculite in the Hot Springs-Little Rock area exhibits the texture, in scan electron micrographs, of a thermally metamorphosed rock formed ostensibly from cryptocrystalline chert. The stratigraphic formation, named Arkansas Novaculite, grades from a metamorphic rock in central Arkansas to typical cryptocrystalline chert at Atoka, Oklahoma, 250 air-km west. The Bigfork chert behaves similarly. It appears desirable to restrict the term 'novaculite' to a petrologic name for a thermally metamorphosed ...
Reports by Author
