Syringopora reticulata, Turbinolia
fungites, Lithostrotion irregulare.
_Echinodermata_ Actinoerinus aculeatus, et
,, laevissimus, Platyerinus laevis et
,, rugosus.
,, Poteriocrinus crassus, et pentagonus.
Rhodocrinus costatus, et granulatus.
_Mollusca Dimyaria_. Pallastra complanata.
_Brachiopoda_. _Terebratula_ hastata.
,, Spirifer glaber, et rhomboideus.
,, Chonetes cornoides, et papilionacea.
,, _Leptoena_ analoga.
,, _Productus_ cora, et longispinus, et
martini, et pustulosus et cornoides.
_Lamellibranchiata_. Monomyaria.
Aviculopecten fallax.
Dimyaria.
Psammobia complanata.

Pisces.

Ctenacanthus tenuistriatus.
Cladodus conicus.
Psammodus porosus, et rugosus.

[Picture: Vertical section of the Plump Hill]

The millstone grit beds immediately succeed those of the carboniferous
limestone just described, forming a similar belt round the Forest, and
disappearing with it on the Blakeney side of the basin. Its chief
interest consists in the circumstance that it has been employed from very
early times as a material for building; for though it contains a vein of
iron ore, little has been done in mining it. Most of the old buildings
adjoining the parts where this grit crops out are formed of it, as
several of the ancient neighbouring churches show, and likewise the
oldest lodges in the Forest; now, however, this kind of stone is seldom
used except for boundary walls, and such kind of rough work.

The rest of the outer circle of high land, on whose summit the observer
has been supposed to be standing, and which so definitely marks the
Forest coal-field, comprises the _lower_ coal measures, containing the
lower and upper Trenchard veins, the Coleford High Delf, with the
Whittington and Nag's Head seams, which together give about eleven feet
of coal. Of these the Coleford High Delf, averaging a thickness of
upwards of five feet, and extending over an area of 1