6.3 SEDIMENTARY MODELS
219
Fig. 6.28. Ephemeral playa lake, with braided alluvial outwash fans at the feet of distant jebels, Sinai, Egypt.
High, 1968), the Lockatong Formation of the Newark Group of New Jersey and Pennsylvania (Van Houten, 1964), and the red Keuper marls and Mercia mudstones and associated evaporites of northwest Europe.
In summary, ancient lacustrine deposits can generally be recognized with some confidence by the absence of a marine fauna. A single well-defined lacustrine sedimentary
model has not been established, because of the variability of climate and sediment
Fig. 6.29. View of playa lake mud surface with desiccation cracks, Sinai, Egypt. Note the scattered granules
and sand grains. These were carried out on to the playa surface by flash floods. The presence of scattered wellrounded sand grains in a red mudstone is a diagnostic feature of a playa lake origin.
219
Fig. 6.28. Ephemeral playa lake, with braided alluvial outwash fans at the feet of distant jebels, Sinai, Egypt.
High, 1968), the Lockatong Formation of the Newark Group of New Jersey and Pennsylvania (Van Houten, 1964), and the red Keuper marls and Mercia mudstones and associated evaporites of northwest Europe.
In summary, ancient lacustrine deposits can generally be recognized with some confidence by the absence of a marine fauna. A single well-defined lacustrine sedimentary
model has not been established, because of the variability of climate and sediment
Fig. 6.29. View of playa lake mud surface with desiccation cracks, Sinai, Egypt. Note the scattered granules
and sand grains. These were carried out on to the playa surface by flash floods. The presence of scattered wellrounded sand grains in a red mudstone is a diagnostic feature of a playa lake origin.