Examples of calcareous

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The c. 25 m of purple, fine-grained sandstones below include quartz-arenitic intercalations and have an essentially calcareous matrix.
Quantitative estimates of calcareous nannofossil species abundance were carried out using a polarizing light microscope at a magnification of x1250.
Soils are calcareous, poor in fertility and characterized by a soil crust formation.
The powder identified as calcite in a fracture line of the substratum we believe originated from the penetration of calcareous deposits in ground water.
The underlying rock from which the water was abstracted, was calcareous and the depth of the borehole was about 60 m.
Their abundance is consistent with observations of calcareous substrates elsewhere in the world.
Species richness in calcareous grassland is affected by dispersability in space and time.
Calcareous sandstones occur at 0.33 m, 0.55 m and 2.6 m above the base of the formation.
This is probably due to homogenization of calcareous horizons at the higher grades.
For the calcareous nannofossil analysis, smear-slides from samples of all the rock-types (marly limestone, marl, calcareous shale and black shale) were prepared.
In addition, calcareous corpuscles were abundant in the neck region and few small granules aggregated in the rostellum of the cysticerci from the gerbils.
These geological formations consist of layers several kilometres thick and mainly include sandstones, calcareous sandstone and marls.
The track-bearing layer consists of a well-laminated, calcareous, black shale in an alternating sand/shale succession.
This includes the newly reclaimed land of sandy, calcareous and saline origin.
The conglomerates pass gradually upwards into highly calcareous sediments ranging from phyllite to siltstone and sandstone as well as limestone conglomerates.
The third type of cycle, up to 6 m thick, consists of thickening- and coarsening-upward calcareous sandstone beds and thin interbedded mudstones.

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