Here, there are no Palaeozoic materials, although carbonated sediments--nearly pure limestone, olistostrome
and dolomite--occur with turbidite, gaps, marl, clay and sandstone.
One area, the Bisoni-McKay, at the south end of the Fish Creek Range, displays an olistostrome
, shed eastward during the Late Devonian (early Famennian) from a migrating Antler orogenic forebulge.
The Western Precordillera is characterized by olistostrome
or melange deposits, related to extensional tectonics during Ordovician times, in a continent-ocean transition (von Gosen, 1992; Astini, 1997; Keller, 1999; Alonso et al., 2008a) and ocean floor sediments with pillow basalts in the westernmost part (Kay et al., 1984; Gonzalez-Menendez et al., 2013).
Structure and evolution of the 'olistostrome
' complex of the Gibraltar Arc in the Gulf of Cadiz (eastern Central Atlantic): evidence from two long seismic cross-sections.
The Western Precordillera is characterised by Cambrian-Ordovician olistostrome
or melange deposits related to extensional tectonics in a continent-ocean transition (Astini, 1997; Keller, 1999), and ocean floor-like sediments with pillow basalts in the westernmost part (Kay et al., 1984), indicating the existence of an ancient continental margin (e.g.
Ashbum), then unconformably by Eocambrian(?) grey sandstone with conglomerate or olistostrome
of Simonton Corners (=?
The allochthonous Silurian--Devonian in olistostromes
at "the Southern Variscan front" (Tinerhir region, SE Morocco)--Preliminary data.
10) including calciturbidites and olistostromes
(mega debris flows) containing olistoliths (clasts) as large as automobiles.
It was also demonstrated that the common association of 'tillites and carbonates' was the product of active tectonic settings in which non-glacial marine mass flows were interbedded with olistostromes
, debris flows and turbidites composed of detrital, reworked carbonate (Schermerhorn, 1974).