Unformatted text preview: boundaries within the polycrystalline, microncrystalline rock while a monocrystaline quartz grain can only break with fracture (takes more energy). Also, breakage following the irregular grain boundaries in chert results in an angular grain. OR chert has a local source and is less abraded 7) XXL a) Rock fragments are very well rounded, quartz is subrounded b) California coast most effective (3 vs 4) 8) ZEV a) Very well to well-sorted b) subrounded 9) XTE a) subrounded to rounded (some subangular to angular) b) fairly immature - hundreds of km 10) AI-88-105 a) well to very well within laminae, but overall moderate sorting (some places poor) 1...
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- Spring '08
- Holocene Sands, subrounded. b