12 depositional sedimentary environments lab | Geology homework help
- Carbonate Reef/Platform- Unbedded, very fossiliferous with large and small scale, very course grained sediment. Abundant, often large, organisms attached to the sea-floor, high energy environment. 3. Deep Ocean- shale, fine-grained limestone and/or sandstone; graded bedding produce by turbidity currents; large fossils rare; microfossils may be abundant; sheet to fan-like shape.
So ur ce : S ta ce y M et zl er The following charts summarize the previous discussion ALLUVIAL FAN FLUVIAL (river) LACUSTRINE (lake) AEOLIAN DESERT (dunes) PALUDAL (swamp) ROCK TYPE breccia, conglomerate, arkose conglomerate, sandstone, siltstone, shale siltstone, shale, limestone, evaporites quartz arenite, (sandstone) gypsum peat, coal, siltstone, black shale composition terrigenous terrigenous terrigenous, carbonates, evaporites terrigenous or evaporite terrigenous color brown or red brown or red black, brown, grey, green, red yellow, red, tan, white black, gray or brown grain size clay to gravel clay, silt, sand, gravel, fining upward clay, silt, sand (coursening upward) sand clay to silt grain shape angular angular to rounded ---- rounded or polished ---- sorting poor variable variable good variable inorganic sedimentary structures cross bed and graded bed assymmetrical ripples, crossbedding, graded beds, tool marks symmetrical ripples, lamination, cross beds, graded beds, mud cracks, raindrops crossbedding laminated to massive organic or biogenic structures ---- tracks, trails, burrows tracks, trails, burrows, rare stromatolites tracks and trails root marks, burrows fossils ---- rare freshwater shells, bones, plants fragments freshwater shells, fish, bones, plant fragmetns ---- plant fossils, freshwater shells, bone, fish Continental- Sedimentary Depositional Envirnonments So ur ce : S ta ce y M et zl er
DELTA BARRIER BEACH LAGOON TIDAL FLAT
ROCK TYPE sandstone, siltstone, shale, coal quartz arenite, coquina siltsone, shale, limestone, oolitic limestone, gypsum siltstone, shale, calcilutitie, dolostone or gypsum composition terrigenous, some organic terrigenous or carbonate terrigenous, carbonate or evaporite terrigenous, carbonate or evaporite color brown, black, grey, green, red what to tan dark grey to black or brown grey, brown, tan grain size clay to sand (coursening upward) sand clay to silt clay to silt grain shape ---- rounded to angular ---- ---- sorting variable good poor variable inorganic sedimentary structures cross bedding, graded bedding cross bedding, symmetrical ripples lamination, ripples cross bedding lamination, mudcracks, ripples, cross bedding organic or biogenic structures trails, burrows tracks, trails, burrows trails, burrows stromatolites, trails, tracks, burrows fossils plant fragments, shells marine shells marine shells marine shells Transitional- Sedimentary Depositional Envirnonments So ur ce : S ta ce y M et zl er
REEF CONTINENTAL
SHELF CONTINENTAL
SLOPE AND RISE ABYSSAL PLAIN
ROCK TYPE fossiliferous limestone sandstone, shale, siltstone, fossiliferous limestone, oolitic limestone litharenite (grewacke), siltstone and shale, limestone shale, chert, micrite, chalk, diatomite composition carbonate terrigenous or carbonate terrigenous or carbonate terrigenous or carbonate color grey to white grey, brown, tan, green grey, green, brown black, white, red grain size variable frameworks, few to no grains clay, silt, sand, gravel clay to snad clay grain shape ---- ---- ---- ---- sorting ---- poor to good poor good inorganic sedimentary structures ---- lamination, cross bedding graded bedding, cross bedding, lamination, flute marks, tool marks (turbitdites) lamination organic or biogenic structures ---- trails, burrows trails, burrows trails, burrows fossils coral, marine shells marine shells, sharks teeth marine shells, rare plant fragments marine shells (mostly microscopic) Marine- Sedimentary Depositional Envirnonments
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