large portion of calcareous earth ; the lime-
ftone in return partaking of its daik colour
feveral feet from where they are in contact.
SECTION
S E C T I O N III.
2*he fuhjedl continued\ Further account o f
the Strata o f Derhyjhiret particularly o f
the Llmefone and Foadflone.
H A V IN G thus difcufled the fuperior
ftrata, I {hall next proceed to others which
are more interefting to the miner and geo-
logift.
No, 4. (fee plate 1.) The firft ftratum
of limeftone is regularly ftratified, and varies
conliderably in depth, being in fome places
thin, while in others, as already mentioned,
it is extended to more than two hundred
fathom. It forms the uppermoft ftratum
eaft of Wirkfworth, at Matlock, at Winfter,
Aftiford, Eyam, Buxton hills, Monyafh, and
fouth of Caftleton. It lies in lamina;, more
or
