Morne L'Enfer Formation
The Morne l'Enfer is comprised predominantly of massive sandstones interbedded with siltstones and clay-shales
which are commonly lignitic and pyritic. The sandstones are generally fine grained to very fine grained, subangular
ard well sorted with carbonaceous material and glauconite as accessory minerals.
The sandstones frequently grade into siltstones. Two persistent silt layers are present within the formation, the
Coora Silt and the Lot 7 Silt, occurring at approximately 200-250 ft. and 1,000 ft. respectively above the base
of the formation. Both serve as reliable structural markers, particularly the Lot Silt which has proved to be an
excellent seismic reflector.'
At its maximum development in the Erin Syncline the Formation is about 4000 feet thick. Its contact with the underlying
Forest Formation is unconformable.
On the Kugler (1959) it occupies the 6a, 6b, 6c and 6d interval. The Lot 7 Silt subdivides the Formation into an Upper (tidal - fluvial)and Lower ( inner neritic - brackish water) member.
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