Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Ch. XXIV.] BRACKISH-WATER AND MARINE STRATA. 493 of France and Germany.' It has been traced for thirty miles in a straight line, and can be recognized at still more distant points. The characteristic fossils are a small bivalve, having the form of a Cyclas or Cymia, also a small entomostracan which may be a Oypris, or, if marine, a Cythere (fig. 546), and the microscopic shell of an annelid of an extinct genus calle
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Ch. XXIV.] BRACKISH-WATER AND MARINE STRATA. 493 of France and Germany.' It has been traced for thirty miles in a straight line, and can be recognized at still more distant points. The characteristic fossils are a small bivalve, having the form of a Cyclas or Cymia, also a small entomostracan which may be a Oypris, or, if marine, a Cythere (fig. 546), and the microscopic shell of an annelid of an extinct genus called Microconchus (fig. 545) allied to Serpula or Spirorbis. Fig. 545. Fig. 546. (^ a. Microconchus (Spiror- bis) carbonarius. Nat. size, and magnified. b. Var. of same.
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