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CHAPTER III.

nian.

Upper Middle Lower

Devo- Devo-

nian.

nian.

old Red Sandstone

Devonian

LYNTON SANDSTONE (FORELAND GROUP)

LYNTOX SLATES

HANGMAN Grits (MARTINHOE Beds) .

ILFRACOMBE GROUP

MORTE SLATES (MORTEHOE GROUP)

PICKWELL Down SANDSTONES.

BAGGY AND MARWOOD SLATES (CUCULLÆA ZONE)

Pilton Beds.

Relations of Old Red Sandstone and Devonian

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Devo-

CHAPTER IV.

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Carboniferous

TUEDIAN GROUP

Lower LIMESTONE SHALE

CARBONIFEROUS OR MOUNTAIN LIMESTONE

YOREDALE ROCKS AND UPPER LIMESTONE SHALE

MILLSTONE GRIT

Coal MEASURES

Upper Lower

Carboni- Carbonia

ferous ferous.

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