. The earth in past ages . the upper Oolites of England. These three divi- sions in this country are greatly subdivided by differences in min- eral character, as well as by fossils. The Lias is gen- erally recognised by the great breadth of country that it covers be- tween Whitby and Lyme Regis, by its thickness, and its many sub-divis- ions which are traced through the country. It is. as a rule, a blue-black clay alternating with thin, regular layers of earthy limestone, that the alternations of clay and limestone which characterise the Kinetic beds are continued, with a multitude of repetiti
. The earth in past ages . the upper Oolites of England. These three divi- sions in this country are greatly subdivided by differences in min- eral character, as well as by fossils. The Lias is gen- erally recognised by the great breadth of country that it covers be- tween Whitby and Lyme Regis, by its thickness, and its many sub-divis- ions which are traced through the country. It is. as a rule, a blue-black clay alternating with thin, regular layers of earthy limestone, that the alternations of clay and limestone which characterise the Kinetic beds are continued, with a multitude of repetitions. The bias limestones metimeS a tendency to be brown. The thickness of the Lower Lias varies between 500 feet at Lyme Regis and Soo feet on the Yorkshire coast. The common bias I Oyster is the Gryphaea I ' ISlOnally, in the country towards me the bias almost thins away where it n the Carboniferous limestone, and it is e that the different beds vary in thickn< '.v. The marine and terrestrial sauri; d chiefly in the lower beds of the 1 ,w 1 in the south of England. They include both [chtl nirs. Nearer the top , . â terrest rial ar- jDUT\*T«r oavujlsToric Map OF an Fig. 19.âMap of an outlier of Lias be- tween Market Drayton and Whit- church, proving that the Lias was spread over the \\ I land.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
