©Copyright 2018 GEOSCIENCE RESEARCH INSTITUTE
11060 Campus Street • Loma Linda, California 92350 • 909-558-4548
The Fayaux Quarry exposes many turbidites of the Gurnigel Nappe. Each light-colored layer is part of a turbidite. Note people for scale.
Turbidites and debris flows of the Niesen Nappe above the town of Le Sépey. This is at an overturned section of the Niesen Nappe.
View of a single thick turbidite at Le Sépey. The letters identify the various units of the Bouma sequence. Note that the order of the units is reversed, because at this locality the Niesen Nappe is overturned.
Jasper, Precambrian turbidites
Banff, turbidites (Jurassic)
Outsized clasts are isolated rock fragments encased in much finer sediment and their mode of transport and deposition is therefore puzzling. One way to explain their occurrence is the "dropstone" model (vertical sinking from floating rafts or icebergs). However, gravity flows can also carry outsized clasts in sand-laden waters. This picture shows a well-rounded granitic outsized pebble encased in bioturbated sandy turbidites of a submarine channel complex of the Mio-Pliocene Capistrano Formation (San Clemente State Beach, California). Scale in cm.
UPLIFTED: Turbiditic deposit near McCoy --- Deposition is by underwater mudflows. Vertical layers are due to later uplift of hardened rock.