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A fossil trackway is a type of trace fossil, a trackway made by an organism. Many fossil trackways were made by dinosaurs, early tetrapods, and other quadrupeds and bipeds on land. Marine organisms also made many ancient trackways (such as the trails of trilobites and eurypterids like ''Hibbertopterus''). Some basic fossil trackway types: :#footprints :#tail drags :#belly drag marks-(tetrapods)〔(''"Designed for life in the shallows,"'' Earth History )〕 :#chain of trace platforms–(example: Yorgia) :#body imprint-(Monuron trackway, insect) The majority of fossil trackways are foot impressions on land, or subsurface water, but other types of creatures will leave distinctive impressions. Examples of creatures supported, or partially supported, in a water environment are known. The fossil "millipede-type" genus ''Arthropleura'' left its multi-legged/feet trackways on land. ==Hominid trackways == The foremost hominid trackway is the 3.7 mya Laetoli footprints of Tanzania. The trackway is now preserved under a protective layer of earth.〔(Photo: Wikimedia Commons )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「fossil trackway」の詳細全文を読む スポンサード リンク
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