is no temptation to ignorant peasants to move flints until they are
induced by collectors, so the whole fault of the wreckage that has
taken place in many sites lies on the plundering collector. No money
or reward should be given for any flints; a few fine specimens may be
lost, but vastly more harm would be done by encouraging mere raiding.

The periods and styles that are now recognized are shown on the
diagram--and their conditions were:

Style Climate Sea level

Eolithic (Pliocene) ?
Rostrocarinate (Crag) ?
Strepyan warmer lower
Chellean warm low
Acheulian cooler rising
Mousterian cold high
Aurignacian less cold lower
Solutrean warmer low
Magdalenian colder rising
Neolithic as present


Differences of heat may be 20 degrees or 30 degrees + or -
Differences of level may be 600-800 ft. + or -

The information required of all observers is the level and conditions
of all flint tools that they may see or collect.

Gravels