dufresnii

Updated: July 27, 2025

Oliva Dufresnii, Bast. Bolderberg, Belgium; natural size. a. Front view. b. In a small hill or ridge called the Bolderberg, which I visited in 1851, situated near Hasselt, about forty miles E.N.E. of Brussels, strata of sand and gravel occur, to which M. Dumont first called attention as appearing to constitute a northern representative of the faluns of Touraine.

Sir Charles Lyell - The Student's Elements of Geology