Mariopteris muricata (Brongniart) Zeiller 1879.
Spit nodule. On the inside are the remains of 6 separate seed fern fronds. Both positive and negative sides. Nice detail under magnification.
Carboniferous, Westphalian, Duckmantian, Shales above the Wigan 9 foot coal.
Crock Hay Opencast Pit. near Wigan, Lancashire.
Nodule : 9 x 6.5 cm.
