Shale was formed at the bottom of the lake, trapping an incredible range of plants and animals.
(Shale; was formed; L:at the bottom of the lake; trapping an incredible range of plants and animals) (Shale; trapping; an incredible range of plants and animals)
Shale Shale
was formed trapping
L:at the bottom of the lake trapping an incredible range of plants and animals
an incredible range of plants and animals