[3] It is conserved as a marginal facies of the Reading Formation found in the Lane End area containing beds of quartz and lydite gravel not found elsewhere in the formation and capped by a rare outcropping of London Clay proving the inclusions are an original part of the sequence and not a later addition.

The inclusions are significant because they provide paleogeographic evidence for a riverine sequence bringing Early Cretaceous and Jurassic material, from a breach in the chalk in a north-westerly direction, to the Eocene sediments of the Reading Formation found at Lane End

Brecciate and conglomeratic beds, consisting of angular and rounded pieces of clay in a sandy matrix, are of common occurrence in the Reading series; subangular flints, also, have been noted in many places (though rarely in such quantities as here), but I can find no record of the occurrence of gravel abounding in pebbles of quartz and lydite in that series in any part of the London Basin."

Although the Bolter End pit is not capped by the London Clay, its horizon can be determined by the nearby Finings Wood and is not in doubt.

- Wooldridge 1934There are no currently visible features of the pit and the interest could readily be investigated at any number of locations in the surrounding area.