EARTHSC 1G03 Lecture Notes - Lecture 12: Yoho National Park, Burgess Shale, Siltstone
11 Sep 2018
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Document Summary
Characteristics: most are fine-grained, most are clastic (have pieces of older rock, some are biochemical something living was involved in making that kind of material, most are deposited in the ocean, under water. Lith" just means rock: the grains of a clastic rock are cemented during burial - the combination of cementation and compaction during burial causes hardening or lithification of the rock, the following processes may be involved: Compaction: reduction in volume of sediments resulting from weight of newly deposited sediments above. Cementation: a process by which precipitates bind together the grains of a sediment, converting it into a sedimentary rock (usually quartz or calcite) ends with this (the final process in lithification) Shale vs. siltstone: shale is more fissile (finer layers) and has no grit, siltstone breaks into coarser layers (thicker layers) since sediment is more coarse, may feel grit with fingers, can definitely feel grit with teeth.
