这些足迹仍非常清晰，而且深陷在砂岩河床上，似乎这只霸王龙上个星期才刚走过一样。
The imprint is well defined and deeply embedded in the sandstone riverbed, as if the tyrannosaur had walked there only last week.
龙西油田高台子油层岩性以含泥粉砂岩为主，泥质含量7。
Reservoir formations Gaotaizi of Longxi oil fields are mainly shaly siltstone with shale content 7.
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