chalkstone


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chalkstone

(chôk′stōn′)
n.
See tophus.
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References in periodicals archive ?
In the mineral and chemical discontinuity bed (operationally marked as D-3), featuring the above calcite minimum inside the chalkstone complex, the carbonate content again increases.
The importance of the general change of the sediment composition over and below this border ranks it among an equivalent mineral and chemical discontinuity (D-l) with a bed border inside the chalkstone komplex (D-3) that is considered to be the Jizera and Teplice formation.
The uppermost part of the borehole profiles of these drills is in all the cases represented by a huge oscillation carbonate maximum (chalkstone complex) that in other areas of the basin explicitly represents so-far acknowledged the Jizera formation (Zahalka's zone IX, Soukup's zone IXcd).
Elsewhere in the basin under this chalkstone 10-15-m thick positron there is a glauconitic lamina that is a beginning of the zone VIII, VII.
In the zone VII-VII calcite content there is a substantial drop of its quality by several tenths of percent comparing to the upper part chalkstone position on the basis of the zone IXab (in Poohri Xb-"body").
Chalkstone complex in the uppermost parts of the boreholes, representing the eastern Poohri region and stratigraphically considered to be the zone Xd, does not correspond to the same zone, earmarked in the western Poohri region profile.
This way the eastern part is stratigraphically shifted up approximately by 30-40 m to the upper part and the chalkstone complex of the uppermost part of the Jizera formation is correlated with younger Rohatce formation (the Brezno formation, Coniacian) in the profile of the western Poohri region, represented by the Pd-1 borehole.
The morphology of the curve of carbonate content, representing here Soukup's zone IXcd, is identical with the course of the same curve of the chalkstone complex, creating the uppermost part of the Rohatce platform (Figs.
This correlation shows that most of the boreholes in their beginning part went through the chalkstone complex that is in this area mistakenly considered to be (with the exception of the Pd-1 borehole) the zone Xd.
The base chalkstone position Xb in the Poohri region reaches the thickness of 5-8 m and it is a typical chalkstone position in the whole Bohemian Cretaceous Basin also outside the Poohri region.
These drawings and sculptures in turn played off the three photographs in the space--of two piles of blue-gray bowls, chalkstones washed by waves, and blurry sunlight on a checkered floor--in differing degrees of abstraction, up and down the ladder of logical types between handmade and photographed representations.
When he makes all the stones of the altar as chalkstones that are beaten in pieces, So that the asherim and the sun images shall rise no more (27:9).