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Encyclopedia Britannica - Main :: AUD-BAI |
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AYMESTRY LIMESTONE , an inconstant limestone
series of Silurian
Lower
Herefordshire
limestone
the Abberley Hills, May Hill and the Malvern
character it varies greatly; in one place it is a dark grey, somewhat crystalline limestone, elsewhere it passes into a flaggy, earthy or shaly condition , or even into a mere layer of nodules. When well developed it may reach 50 ft. in thickness in beds of from r to 5 ft.; in this, condition it naturally forms a conspicuous feature in the landscape because it stands out by its superior hardness from the soft shales above and below.The most common fossil is Pentamerus Knightii, which is extremely abundant in places. Other brachiopods, corals and trilobites
SILURIAN
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