Around London, R. triquetrus is now largely restricted to calcareous soils, whereas P. schreberi, a strict calcifuge, remains frequent on acid soils in this region.
Cast enough doubt on enough results and the legitimacy of every elected officeholder dissolves like the calcareous shells of so much phytoplankton doused in nitric and sulfuric acid.
Zone 5 is characterized by deep-shelf, pro-deltaic, and shelf edge settings below storm wave base and generally lacking benthic calcareous algae.
Rendzina - a shallow calcareous soil that develops where limestone/chalk is the parent material.
Typically, fens with pH values above 6.0 are associated with calcareous groundwater.
It consists of phyllites, calcareous sandstones and limestone conglomerates that are boudinaged and folded.
They migrate along the inner face of the blastula wall to form a ring in the vegetal region and lay down calcareous skeletal rods.
Symptoms of iron chlorosis, observed as yellow striping on corn leaves, may occur on highly calcareous or saline-sodic soils with pH levels above 7.8.
Paleoenvironmental interpretation of the overlying interbedded calcareous shales and thin molluscan limestones is beyond the scope of this report.
Laessle noted the importance of the calcareous nature of the midden soil and its affect on species distribution on the Orange Point shell mound in Florida.