Geology Reference
In-Depth Information
Fig. 18.26
Schematic west-southeast cross-section through the
Mediano and Virgin de la Collada lateral ramps showing the
SE-ward stratigraphic displacement of barrier islands, inlets and
tidally-dominated back-barrier environments. (Not to scale, see
also Fig.
18.9
. Modifi
ed after Donselaar
1996a
)
Fig. 18.27
Paleogeographic reconstruction of Lutetian coastline
development in the area NW of Graus. (
a
) Situation prior to the
initiation of transgression. (
b
) Doming of the Mediano High
caused subsidence of adjacent areas and the start of relative
sea-level rise. Flooding occurred of the Capella coastal plain
and the Pano barrier chain was formed. (
c
) Phase of maximum
fl ooding and development of the Grustán barrier chain (3) and
tide-dominated back-barrier area; the Pano (1) and Panillo
(2) barrier chains are abandoned and drowned (modifi ed after
Donselaar
1996a
)
overlying flood-tidal delta that formed in the
embayment supposedly behind an inlet between two
barrier islands. Large inclined avalanche foresets dip-
ping into the embayment characterise the deposit.
Associated feeder channels are preserved in which
cross-laminated sets have an E-W bimodal fl ood-dom-
inated foreset dip distribution. Small-scale planar cross-
stratifi ed sets with opposite paleocurrent directions on
top of convex-up reactivation surfaces illustrate the
tidal signature of the deposit (Donselaar
1996a
) .
