PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2009-11-15 NOTE = "Sample description" END_OBJECT = TEXT END High-level Description: Unit 12. Coarse-grained surge layer. Cross bed pinches (weathers out) from 9 cm to <1 cm thick. Layer is comprised of red, black and buff clasts 0.3-1 mm across (average 0.6 mm), along with 10% abraded olivine. Texture Grain morphology and appearance: Small, angular to sub-rounded grey grains in a clast-supported matrix, cross-bedded. Texture is rough and grainy; some texture may be due to the presence of sub-resolution ash grains. Some olivine grains are present. Grain size and sorting: Poorly-sorted; 0.3-1 mm diameter grains, averaging about 0.6 mm across. Grain fabric: Random orientation. Sediment structure: Cross-bedded lamination. Color: Black, buff, red and green-clear grains.