Chalk formation

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See Cretaceous formation, under Cretaceous.

See also: Chalk

References in classic literature ?
The swede-field in which she and her companion were set hacking was a stretch of a hundred odd acres, in one patch, on the highest ground of the farm, rising above stony lanchets or lynchets--the outcrop of siliceous veins in the chalk formation, composed of myriads of loose white flints in bulbous, cusped, and phallic shapes.
These oil and gas properties are currently producing primarily from theAnacacho and Austin Chalk formations and also include the deep rights in approximately 1,500 net acres, for the development of the Eagle Ford Shale and Buda formations, which are below the base of the Austin Chalk formation.
On 2 November 2011, the trust had signed a non-binding letter of interest for the sale of its net profits interests attributable to underlying working interests in certain fields that produce from the Cotton Valley and Austin Chalk formations in Texas and the Chalkley field in Louisiana.
The company added a second drilling rig in January 2011 in order to more fully develop shallow reservoirs above the Eagle Ford shale including the Olmos, Escondido and Austin Chalk formations.
After testing a total of four separate intervals in the first well, the Blackwell #10A, Triton has elected to concentrate future activities exclusively in the Lower and Upper Austin Chalk formations, shortening the laterals and concentrating on the stringers contained within the roughly 260 feet pay zones encompassing the Austin Chalk.