Millport Cornstones Member

Millport Cornstones Member (MLC), Great Cumbrae, Carboniferous, Midland Valley of Scotland

The Millport Cornstones Member is part of the Clyde Sandstone Formation.

Name

From Millport, Great Cumbrae, Strathclyde.

Lithology

Grey sandstone and red-brown silty mudstone with pedogenic limestone. See Paterson and Hall (1986); Monro (1999); BGS (in press); BGS (in preparation).

Stratotype

The type area is Millport Bay (NS.157.545), Great Cumbrae, Strathclyde.

Lower and upper boundaries

The lower boundary is conformable (Monro, 1999) and is described as ‘transitional’ (likely to be interbedded) with grey mudstone and dolomitic limestone of the Ballagan Formation (Paterson and Hall, 1986) (Figure 6, Column 2). It crops out in Millport Bay at (NS 1561 5416).

The top of the member is not seen, but is presumed to be transitionally overlain by the Eileans Sandstone Member that crops out on the Eileans in Millport Bay (Paterson and Hall, 1986; Monro, 1999).

Thickness

About 70 m. However, BGS (2008) gave a generalised thickness of 20 m for the formation.

Distribution and regional correlation

Cumbrae isles, Strathclyde.

Age

Tournaisian