GEOL 1020 Lecture 8: Facies
7 Sep 2016
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Facies: observations; what characteristics does a rock possess. Color oxygen level of the depositional environment. Black death: anoxic (low/no oxygen, some organic material (high organic carbon, deposited below o2-poor water surface, swamps, lagoon, deep ocean. Red land: most o2 because on land and exposed to air, deposited by wind/water, but left high and dry (exposed to atmosphere, red = iron oxide/rust, deserts, alluvial fans, floodplains (soil) White beach: indicates shallow, moving (well-oxygenated) water, deposited below the water surface, but in oxygen-rich waters, rivers, beach, shallow, ocean. Sand pressure-> sandstone (energy = high enough to remove clay/silt, but not enough sand meaning rivers/beaches/dunes) Inconsistent energy levels: large energy differences between transport/deposition. Associated with small energy changes between transport and deposition. Poorly sorted: large mixture of grain sizes. Shape how far grains have to travel. Parallel bedding: settles out over time (think snow) . ". no strong current. Cross bedding: most common (wind and water) . ". directional current.
