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sequence boundaries or maximum regression sur-
faces (MRS). The study focuses particularly on the
Base Volgian-Ryazanian Unconformity (BVRU),
an erosive unconformity developed on structural
highs and considered to have been generated by a
major pulse of rifting, Triassic pod  rotation and
salt redistribution. The BVRU separates an under-
lying succession (Callovian-Kimmeridgian age
megasequence; sequences J44 to J63) characterised
by conformable deposition of widespread shore-
face sandstone and relatively thick packages of
coeval turbidite mass flow sandstones from an
overlying succession (Volgian-Ryazanian age
megasequence; sequences J64 to K10) of more
localised shoreface deposition, often condensed
or truncated and with thin coeval turbidite mass
flow sandstones. Sansom (2010) consider that, at
the time the BVRU was developed, a number of
UK
Shearwater
22/30b-11
Elgin
22/30c-13
Franklin
29/5b-F4
Jacqui
30/13-4
Jacqui
30/13-3
30/13-7
BCU
J62 Baylei MFS
J56 Rosen. MFS
J54b Serr. MFS
J54a Glos. MFS
Middle Jurassic
200m
Fig. 5. Regional correlation showing wells referred to by this study. Gamma Ray log colour display according to values:
warm colours (orange) more sandy, cool colours (blue) more shaley. The geographical location of this correlation section is
indicated on Fig. 1. MD: Measured Depth (m); GR: Gamma Ray log.
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