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Fig. 18.8 Block diagram of the Montanyana delta showing alluvial fan and fl uvial feeder systems combining in one delta front with
break-in-slope above the lateral ramp of the underlying Montsec thrust sheet. CSPT Central South Pyrenean Thrust system including
the Montsec Thrust and its lateral ramps (modifi ed after Marzo et al. 1988)
Fig. 18.9 Correlation profi le of the Capella and Pano Fms in the Isábena depression and Virgen de la Collada ramp areas (modifi ed
after Cuevas Gozalo 1989 , and Donselaar 1996a )
in front of the Montanyana shoreline in the west
(Nijman 1998 ) but quickly decreased during westward
progradation of the system to water depths signifi -
cantly less than 20 m (and up to 0). This reduction of
the shelf area reduced tidal amplifi cation. It is esti-
mated, however, that the T-G-A Basin width and length
were largely unchanged (approximately 40 km wide
and 50 km long). Sediment pathways continued into
contemporaneous extensive basin fl oor fan systems
(Hecho Group; Mutti et al. 1972, 1973, 1975, 1985a )
in the trough of the strongly subsiding E-W oriented
Jaca Basin on the footwall. The open connection to the
Atlantic Ocean still existed; no major structural barrier
was present (Mutti et al. 1972, 1985a, 1988 ; Nijman
and Nio 1975 ) .
In conclusion, it is envisaged that the combined
Jaca and T-G-A Basin was located in the margin of the
tidal amplifi cation window (cf. Sztanó and de Boer
1995 ). Despite the fact that average basin length was
favourable for resonant amplifi cation (Figs. 18.3 and
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