Knockerk Formation

Geology

Group: Grangegeeth

Members: unnamed (1), Brickwork's Quarry Shales (4), Knockerk House Sandstone (4), Knockerk House Shales (3)

Lithologies: mudstone (3), "shale" (8), siltstone (4), sandstone (5)

Paleoenvironments: deep subtidal shelf (1), transition zone/lower shoreface (4), offshore (7)

Age range: base of the Harnagian to the top of the Burrellian or 458.20000 to 452.50000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Harnagian458.2 - 457.2Ireland (50607)
Caradoc458.2 - 449.5Ireland (50599 50600 50601 50602 50603 50604 50605 50606 50608 50609)
Burrellian456.6 - 452.5Ireland (Leinster) (89135)