File 2249/1915 Pt 4 ‘Oil: Mesopotamia & Persia. (General File) 1920–24’ [‎136r] (271/484)

L 2 ?SsaF
of Siah Kuh (called Kuh-i-Dehluran on the map) *1. The
inference is that this oil comes from Cretaceous or lower.Were
the oil derived from Fars one would expect the seepages to
occur along the outcrop of the fars and not to come up impar
tially through Fars and beds Stratigraphically thousands of
faet lower than Fars*
The Fissure Theory . The above-mentioned mode of occurrence i*e seepages
in lines perpendicular to the exis of the anticline and to the
grain of the country,suggests oil reaching the surface by
means of fissures or planes of fracture whose presence is
intimately connected with the "Tang" forming forces which have
riven open both Siah Kuh and Kabir Kuh ranges.To give one
concrete example of the magnitude of this Tang action - in the
Kabir Kuh one tank or rift was seen to have split the hill
across,without vertical dis^lacement,leaving a wedge shaped
gash extending from the crest of the ridge downwards to a
depth of one or two thousand feet.Why should such places of
fracture not continue downwards and so enable deep seated oil
to reach the surface ?•
Consider another case - At Pari Paling in Kalhur country
occurred what might be term| a "fossil Atash Gah". This is a
fissure along a major joint in Upper Fars sandstone and up
this fissure oil and gsus had come, igni ted, and burned so fierce
ly as to fuse the adjacent country rock. Hear the fissure
sandstone was altered to a black vesicular slag,further out it
was baked to quartzite and rendered columnar,while clay had
been altered to porcellanite. Tracing this fissure furtner
along and deeper down to a spot where no burning had taken
place it was found to contain a three foot thick vein of
manjak. For the purposes of the present argument the essential
points in this case are:-
Poot note 1. Mr. Mayo * s map shows the core of this anticline as
asmari Timestone but it is undoubtedly cretaceous.This is not
meant for an overt criticism of Mr.Mayo’s work, considering
the time Mr .Mayo had at his disposal and u ^ der
which he had to work it is little wonder tnat tne a^e cu a
rook is misplaced.The marvel is that a map wi^ ^
and accurate information could he produced in tne time and tne
writer The lowest of the four classes into which East India Company civil servants were divided. A Writer’s duties originally consisted mostly of copying documents and book-keeping. has much pleasure in tbij^s noting his appreciation*