L07_Sed Structures I_Key

L07_Sed Structures I_Key - 13) A) (missing) B) upper plane...

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Lab 7: Sed Structures I -- KEY 2) Symmetric (2-D); straight-crested; oscillation wave ripples 3) Asymmetric (3-D); very sinuous; flow B to A 4) A up, Flow D to C 5) B = up, D to C = direction of transport 6) B = up, D to C = direction of transport (almost looks herring bone but hard to tell at this scale) 7a) A to B = direction of transport 7b) (is missing) 8) large size of cross beds (The original key asks for two. This is the only sure feature that indicates that these are dunes.) 9) A 10b) mustone is redder 11) flaser to wavy 12a) Castille Fm. 21-22 years 12b) complex - possibly 3 winters and 4 summers with occasional early thaws?
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Unformatted text preview: 13) A) (missing) B) upper plane bed: fine-grained with horizontal laminae ; skeletal fragments (ostracods) 14a) A to B or B to A; quartz arenite 14b) C to D or D to C 15) post-lithification deformation would be either brittle (or ductile with all beds being deformed); ~3 m; before: bed A is not deformed. 16) It was most likely water logged, and it is composed of non-resistant grains 17) D & A: horizontal laminae, C & B: ripple cross-strata, F & E: flasser and wavy bedding; dark zones are heavy minerals or clays, light zones are sand. 18) 240 cm thick 19) contorted bedding 20 & 21) no question...
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L07_Sed Structures I_Key - 13) A) (missing) B) upper plane...

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