By the late 19th century local fossils had attracted the attention of formally trained scientists.

By the mid-19th century local fossils had come to the attention of formally trained scientists.

The first scientific collection of local fossils began in the mid 19th century.

By the 1850s, formal scientific investigation of the local fossils had commenced.

The local fossils had attracted the attention of formally trained scientists by the 1830s.

They spent the next several weeks collecting local fossils together but would not tell anyone else about their discovery for months.

Marsh hired both of them to acquire more local fossils for him.

Formally trained scientists have been aware of local fossils since at least the late 19th century.

By the late 1700s, local fossils had attracted scientific attention.

While there they wrote about the local fossils they found.