Tidally Laminated Sediments

Accepted 25 may 2007.

Tidally laminated sediments.

Tk s rs sediments from the kap stewart formation in scoresby land are described and interpreted as tidally in d j fluenced detaic deposits. Gon i 2 and john s. In geology lamination is a small scale sequence of fine layers laminae. Laminated glacimarine sediments form by a variety of processes including suspension settling from turbid overflow plumes turbidity current deposition and contour current activity.

Subglacial deformation of pre existing sediments may also produce laminated deposits in the form of glacitectonite and deformation till. A horizontally laminated black mudstone followed by flaser or lenticularly bedded sandy mudstone and erosively overlain by cross bedded channel sandstone. 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 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.

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. Lamina that occurs in sedimentary rocks laminae are normally smaller and less pronounced than bedding lamination is often regarded as planar structures one centimetre or less in thickness whereas bedding layers are greater than one centimetre. One representing the channel 5 meter depth and the other the shallows 0. Sediment delivery from the fly river tidally dominated delta to the nearshore marine environment and the impact of el nin o andrea s.

Revised 3 march 2007. 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. Crockett1 received 24 august 2006. Published 31 january 2008.

The bay is represented in the model by 50 segments composed of two layers.