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  2. Chalk - Wikipedia

    en.wikipedia.org/wiki/Chalk

    These fragments mostly take the form of calcite plates ranging from 0.5 to 4 microns in size, though about 10% to 25% of a typical chalk is composed of fragments that are 10 to 100 microns in size. The larger fragments include intact plankton skeletons and skeletal fragments of larger organisms, such as molluscs, echinoderms, or bryozoans. [3 ...

  3. Chalk Group - Wikipedia

    en.wikipedia.org/wiki/Chalk_Group

    The Chalk Group is now divided into a White Chalk Subgroup and a Grey Chalk Subgroup, both of which are further subdivided into formations.These modern divisions replace numerous earlier divisions, references to which occur widely on geological maps and in other geological literature.

  4. Cretaceous - Wikipedia

    en.wikipedia.org/wiki/Cretaceous

    The Cretaceous is justly famous for its chalk; indeed, more chalk formed in the Cretaceous than in any other period in the Phanerozoic. [27] Mid-ocean ridge activity—or rather, the circulation of seawater through the enlarged ridges—enriched the oceans in calcium ; this made the oceans more saturated, as well as increased the ...

  5. Geology of Yorkshire - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Yorkshire

    The chalk formation of the hills provides exceptionally good drainage, with the result that most of these valleys are dry; indeed, surface water is quite scarce throughout the Wolds. Typically the valleys are hard to see from above, creating the visual impression that the landscape is much flatter than is actually the case.

  6. Chalk stream - Wikipedia

    en.wikipedia.org/wiki/Chalk_stream

    The products of chalk weathering are dissolved in rainwater and are transported in stream flow. Chalk streams transport little suspended material (unlike most rivers), but are considered "mineral-rich" due to the dissolved calcium and carbonate ions. The surface water of chalk streams is commonly described as "gin clear".

  7. Niobrara Formation - Wikipedia

    en.wikipedia.org/wiki/Niobrara_Formation

    The Niobrara Formation / ˌ n aɪ. ə ˈ b r ær ə /, also called the Niobrara Chalk, is a geologic formation in North America that was deposited between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages of the Late Cretaceous.

  8. Play Just Words Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/just-words

    Just Words. If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online! By Masque Publishing

  9. Greenhorn Limestone - Wikipedia

    en.wikipedia.org/wiki/Greenhorn_Limestone

    The Greenhorn marine cycle was the deepest and broadest stage of the Western Interior Seaway, and supported large sharks and the largest of marine reptiles, including Mosasauridae and Pliosauroidea. Fossilized driftwood and dinosaur remains have been recovered from the formation; such remains are presumed washed into the sea by rivers swollen ...