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Geology and Mineralogy, Considered with Reference to Natural ..., Volumen 2
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adapted afford Ammonites ancient animal appear arms arrangement base beds body bones bottom causes Chalk chambers changes character Coal column common composed condition considered constructed containing continually contrivances covered deposits derived discovered earth edges entire evidence example existing external extinct extremity fact feet figures Fishes formation fossil four further genera genus geological head important increase inhabitants internal joints kind known land leaves length less Lias Lignite living lower manner margin mechanical nature Nautilus nearly occur organs origin perfect period plants plates portion position present preserved probably recent referred remains represents reptiles resembling respecting result ribs rocks scales Secondary seems shell side similar single siphuncle species specimen stems strata strength structure surface teeth Tertiary tion Transition transverse plates trunk varied various vegetable whilst