The valleys are composed of limestone, sandstone and siltstone, with deposits of sand, gravel, silt and clay.
en.wikipedia.org At its peak in 1947, the system held almost $3.4 billion in deposits, with more than four million depositors using 8,141 postal units.
en.wikipedia.org The remaining deposits become more visible (increasing tracer uptake, that is, more metabolically active) with cold exposure, and less visible if an adrenergic beta blocker is given before the scan.
en.wikipedia.org When the ocean level was high shallow marine deposits occurred; when they were low fluvial and deltaic deposits form the majority of mass.
en.wikipedia.org Several mapped areas show alluvial deposits that were trenched, and samples for which panned concentrates were developed and the gold content noted.
en.wikipedia.org