calcareous -- adj. Term used to describe a structure, secreted by an organism, that consists of or contains calcium carbonate (CaCO3), e.g., the shell of a bivalve.
A first application of calcareous manure is generally accompanied with great advantage upon these soils; but when once the effect of this application is over, it can hardly be repeated a second time, ...
pelagic ooze A deep ocean sediment consisting of at least 30% skeletal remains of calcareous or siliceous microorganisms, the rest being clay minerals.
A calcareous sea-floor sediment composed of foraminifer shells.
Forset Beds:
The distinctly dipping sediment layers deposited on the front of a prograding delta or on the lee side of a sand dune.
Formation: ...
The most identifying traits of this soil is the presence of calcareous parent material which results in a high pH and strong eluviation of clay from the A horizon.
 See also: Surface, Soil, Layer, Location, Plain
  
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