The 100m thick Formation is divided into sediments of a playa lake system, cyclic sediments of freshwater to saline lake system, and sediments of a playa lake system with crevasse splay.
32.
Toxic substances such as arsenic, lead, mercury and barium, which is used in rat poison, have been detected at Pantex in ditches and shallow playa lakes where treated waste water was once discharged.
33.
The playa lakes, or seasonal lakes, are the primary sources of recharge for the aquifer, with an average of 0.5 inches per year as the recharge rate for the entire High Plains region.
34.
Lying in a field where the birds will feed or near a playa lake the birds will use as a resting place, the hunters are able to get closer to the magnificent birds than anyone.
35.
Though seasonal and temporal, the'big playa lake', in wet periods, is significant in a semi-arid, drought-frequented environment and has been utilized regularly as a food and water resource by man and animal, alike, since prehistoric times.
36.
Two ephemeral playa lakes, Totolcinco ( El Carmen or Totolcingo ) and Tepeyahualco ( El Salado ), lie in the lowest part of the basin ( 2300 meters elevation ), and remain dry for most of the year.
37.
These in turn are currently undergoing erosion by a combination of aeolian and fluvial processes, forming extensive sand dune systems, deep and prolonged development of laterite and saprolite profiles, and development of playa lakes, salt lakes and ephemeral drainage.
38.
Other species of geese, such as white-fronted, snows and blues, migrate to the rice fields near Houston, but a large number of Canada geese make West Texas their winter home, feeding in the peanut fields and roosting around the playa lakes.
39.
Under United States law, a " playa lake " may be considered isolated wetlands, and may be eligible to enroll in the new wetlands component of the Conservation Reserve Program, enacted in the 2002 farm bill ( P . L . 107-171, Sec . 2101 ).
40.
When the ponds and playa lakes of the prairie regions ice over, ducks don't really have a choice other than to head south to warmer climates, and that's the No . 1 factor that determines whether the duck-hunting season here is a good one or a poor one.
