A Playa Lake Usuallycontains Laminated Mudstone

Flash cards for geol 221 history of the earth with heck at ferris state fsu.

A playa lake usuallycontains laminated mudstone. B current rippled cross laminated very. A laminated siltstone and mudstone. Upper regressive lake margin playa lake and mudflat deposits are light to dark gray silty mudstone to argillitic siltstone or very fine grained sandstone mostly thick bedded to massive with desiccation cracks intraformational breccias faint wavy laminations burrows euhedral pyrite grains and dolomite or calcite specks. In central pangea the depositional setting of the mid to late triassic mercia mudstone group in the wessex basin sw england uk was marked by playa lake deposits with red beds and local.

Ripple and horizontally laminated mudstone clayey siltstone and very fine to fine grained sandstone in beds 0 1 to 0 5 m thick. Deposits include three sedimentary facies. Sedimentary successions are interpreted as having accumulated in a playa lake complex. Deposition in distal terminal splay and shallow ephemeral playa lakes.

Sedimentary successions are interpreted as having accumulated in a playa lake complex. Laminate with horizontal bedding and vertical trace fossils. Alluvial fan glacier lake lacustrine meandering stream fluvial desert eolian playa. Skeletal and oolitic grindstone cross bedding and ripple marks.

Red and green well laminated mudstone with very thin cm fine to medium grained sandstone layers. The playa lake depositional model for the three forks formation beatriz garcia fresca. Playa lake depositional environment modern hardie et al. Een mudstone stone laminated tone mudstone d d stone trix d b reccia red e 5.

One with mudstone and sandstone in roughly equal proportions fl a the other with a sandstone mudstone ratio of about 5 1 fl b fig. B current rippled cross. Fine grained well sorted mudstone to packstone. Upper regressive lake margin playa lake and mudflat deposits are light to dark gray silty mudstone to argillitic siltstone or very fine grained sandstone mostly thick bedded to massive with desiccation cracks intraformational breccias faint wavy laminations burrows euhedral pyrite grains and dolomite or calcite specks.

The facies is divided into two subfacies that are gradational. Deposits include three sedimentary facies. A moderately diverse arthropod icnofauna occurs in permian ephemeral lacustrine deposits of the paganzo basin that crop out at bordo atravesado cuesta de miranda western argentina. Mudcracks starved ripples are common.