| Text Description: |
Sampled from a 10- to 12-cm thick, coarse-grained, bright brown-orange tephra layer in a coal bed between the Woodman and Fletcher beds. This sample contains 25-30% fragmented plagioclase grains that are mainly zoned but also twinned. The edges are angular or embayed and glass fringes are present. Next in abundance are 10% blue-green to yellow-green hornblende and 5% pumice fragments. The hornblende may be stubby or splintered, sometimes with glass fringes. Most of the pumice grains appears unaltered. The altered glass is murky. About 3-4% opaques and trace quartz, zircon, biotite, and volcanic rock fragments. Sample is from between the Woodman and Fletcher coal beds. |