Name Velpen applied to the caprock of the Velpen coal of Fuller and Ashley (1902). Shown on correlation chart at the base of the Carbondale group.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Velpen Limestone revised as Velpen Limestone Member of Linton Formation. Occurs above Mecca Quarry shale member (new name). According to authors, Velpen has not been clearly defined. It is not a simple bed of limestone, particularly in area of this report, where it resembles Oak Grove Member (IL) in containing two or more thin limestones separated by drab shale. Thickness is 2.5 ft at West Montezuma.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Indiana Geological Survey drillhole SDH 306 is herein designated the reference core for the Houchin Creek Coal Member of the Petersburg Formation; the Survant Coal, Velpen Limestone, Mecca Quarry Shale, and Colchester Coal Members of the Linton Formation; the Seelyville Coal Member of the Staunton Formation; and the boundary between the Petersburg and Linton Formations. SDH 306 is located near the type section of the Survant Coal Member, in SW1/4 NE1/4 sec. 2, T2S, R7W, Pike Co., southern IN. Velpen measures 3.4 ft in the SDH 306 core where base of unit is black, very argillaceous limestone. Upper 2.8 ft is black, pyritic shale. Overlies Mecca Quarry Shale Member. Occurs 48.2 ft below the Survant Coal Member.

Source: GNU records (USGS DDS-6; Reston GNULEX).