matrix rock造句

The Black Hills Institute preserved even the matrix rock removed from the dinosaur fossil, and this rock is rich in the fossils of other animals, including a well-preserved Cretaceous turtle that lived at the time of Sue.
The holotype, which lacked an inventory number, was apparently found in the famous Posidonia Shale, marine strata dating from the middle Toarcian, as can be established from the presence of the snail " Coelodiscus " in the matrix rock containing the only partially prepared bones.
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