Tidally Laminated Sediments

Crockett1 received 24 august 2006.

Tidally laminated sediments.

Laminated glacimarine sediments form by a variety of processes including suspension settling from turbid overflow plumes turbidity current deposition and contour current activity. In general the glen eyrie tidalite is similar to other carboniferous tidalites because the laminated sequence directly overlies a coal is well laminated directly above the coal and becomes more bioturbated and possesses more fine scale erosional features beginning several meters above the coal. Preston martin 1 miguel a. Two major types of sequences can by destinguished.

A tidally averaged sediment transport model of san francisco bay was incorporated into a tidally averaged salinity box model previously developed and calibrated using salinity a conservative tracer uncles and peterson 1995. However structures from several millimetres to many centimetres. Sediment delivery from the fly river tidally dominated delta to the nearshore marine environment and the impact of el nin o andrea s. A horizontally laminated black mudstone followed by flaser or lenticularly bedded sandy mudstone and erosively overlain by cross bedded channel sandstone.

The bay is represented in the model by 50 segments composed of two layers. At d2 non cohesive sediment and b4 d1 cohesive sediment the critical shear stresses for seabed erosion or resuspension were estimated to be 0 11 and 0 07 0 09 n m 2 respectively. Tk s rs sediments from the kap stewart formation in scoresby land are described and interpreted as tidally in d j fluenced detaic deposits. Although this result is reasonable when only the three sites are compared both values are lower than predicted by existing threshold models with a.

In geology lamination is a small scale sequence of fine layers laminae. One representing the channel 5 meter depth and the other the shallows 0. Revised 3 march 2007. Published 31 january 2008.

Gon i 2 and john s.