stratum
layer of sedimentary rock or soil with internally consistent characteristics
overlying stratum
stratum that another stratum lies under
burned layer
archeological layer
seam
extensive sedimentary deposit of a raw material
overburden
earth and rock covering a mineral deposit
Chiba section
Stratum
Fahlband
stratum in crystalline rock, containing metallic minerals
foundered strata
term used by the British Geological Survey in its maps and geological memoirs, and indeed by other authors, to describe rock strata which have collapsed due, for example, to the dissolution of underlying strata
moler
geological stratum in Fur Formation, Denmark
varve
annual layer of sediment or sedimentary rock
coal seam
geological stratum containing coal