In most Mesozoic land habitats, the most common vertebrate animals were dinosaurs, and Rich Thompson was lucky enough to find large fossil bones among the petrified logs that were eroding out of the hard Cretaceous-age sandstone.
(the most common vertebrate animals; were; dinosaurs; L:In most Mesozoic land habitats) (Rich Thompson; was; lucky enough to find large fossil bones among the petrified logs) (Rich Thompson; to find; large fossil bones; L:among the petrified logs) (the petrified logs; were eroding; )
the most common vertebrate animals Rich Thompson Rich Thompson the petrified logs
were was to find were eroding
dinosaurs L:In most Mesozoic land habitats
lucky enough to find large fossil bones among the petrified logs
large fossil bones L:among the petrified logs