A Playa Lake Usuallycontains Laminated Mudstone

The playa lake depositional model for the three forks formation beatriz garcia fresca.

A playa lake usuallycontains laminated mudstone.

Sedimentary successions are interpreted as having accumulated in a playa lake complex. Alluvial fan glacier lake lacustrine meandering stream fluvial desert eolian playa. Comprised of 20 to 70 cm thick thinning and fining upward sequences. Playa lake depositional environment modern hardie et al.

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. A laminated siltstone and mudstone. Ripple and horizontally laminated mudstone clayey siltstone and very fine to fine grained sandstone in beds 0 1 to 0 5 m thick. A laminated siltstone and mudstone.

Deposits include three sedimentary facies. Deposition in distal terminal splay and shallow ephemeral playa lakes. Rare bioturbation palaeosols. Skeletal and oolitic grindstone cross bedding and ripple marks.

Sedimentary successions are interpreted as having accumulated in a playa lake complex. B current rippled cross laminated very. Mudcracks starved ripples are common. 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.

B current rippled cross. 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. Fine grained well sorted mudstone to packstone. 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.

The facies is divided into two subfacies that are gradational. Een mudstone stone laminated tone mudstone d d stone trix d b reccia red e 5. Red and green well laminated mudstone with very thin cm fine to medium grained sandstone layers. 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.