Geology Reference
In-Depth Information
Fig. 6.19.
Data section along the line
A
-
A'
(Fig. 6.17). No vertical exaggeration. The stratigraphic col-
umn is shown where the trace of the well projects onto the line of section.
Short arrows
at the topo-
graphic surface are the geological contact locations.
Wide short lines
are bedding dips
Fig. 6.20.
Comparison between domain dips, stratigraphic thicknesses, and contact locations.
Short
arrows
at the topographic surface are the geological contact locations.
Wide short lines
are bedding
dips. Dip domains are
numbered
The next step is to establish the domain dips and see how well the domains fit
the locations of the formation boundaries (Fig. 6.20). As a first approximation, the
fit to one backlimb and two forelimb domains is tested. (The forelimb is the steeper
limb.) The dip of domain 1 (3NW) is given by the dip of the line connecting the
base of the Ppv on opposite sides of the Mb inlier. The steeper dips of Mb within
the inlier are caused by second-order structures and do not apply at the scale of
the cross section. The domain 2 dip is the 27NW dip seen at the surface. The do-
main 3 backlimb dip of 6SE is seen in outcrop but is selected primarily because
with this dip the unit thicknesses match the contact locations. Portions of the beds
are drawn in with constant bed thickness to compare with the contact locations. The
domain 2 dip fits both contacts of the Mh, even though this information was not used
to define the dip.
