Our planet, its past and future; or, Lectures on geology . stranger, ptrhaps, than ;iny y«tdiscovered remain to be found : we Jiivc but read a lew-torn leaves of a larfre volume. 182 LECTURES ON GEOLOGT. Fl>S!^il vegetable remains are common, — such as f(;rns,cycads, and conifers, or cone-l>ear iig plants. Thecycads are plants resembling pal ins in their outwardappearance, and cone-bearing trees in their inwardstructure. From the abundance of their leaves andtrunks ft)und in a fossil state in England, they must haveformed at one time a large part of the vegetation ofGreat Britain. Insect
Our planet, its past and future; or, Lectures on geology . stranger, ptrhaps, than ;iny y«tdiscovered remain to be found : we Jiivc but read a lew-torn leaves of a larfre volume. 182 LECTURES ON GEOLOGT. Fl>S!^il vegetable remains are common, — such as f(;rns,cycads, and conifers, or cone-l>ear iig plants. Thecycads are plants resembling pal ins in their outwardappearance, and cone-bearing trees in their inwardstructure. From the abundance of their leaves andtrunks ft)und in a fossil state in England, they must haveformed at one time a large part of the vegetation ofGreat Britain. Insects are very common in some of the limestones ofthis period : several hundred specimens have been dis-covered in liassic beds, which bear a strong resemblanceto living insects. One band of limestone in this forma-tion, found in Gloucestershire, England, has been calledii;sect limestone, from the abundance of their remainsfound in it. Mollusks were numerous, and some of them of greatinterest. Figs. 26 and 27 represent two common forms Fig. 20. Ficr.
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