- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Careful analysis of the frequencies of heavy minerals in the Jurassic and Triassic sediments of York-shire, England, leads to the conclusion that mineralogical changes have been exceedingly active along a belt coinciding with the Cleveland axis. Many minerals are decomposed, others developed authigenically. Strata now appearing as an elongated dome were evidently deposited as successive lenses in a subsiding basin. Alteration of heavy mineral content is of such importance that serious mistakes in questions of provenance may be made if it is not properly taken into consideration.