Laminated Sandstone Facies

Consist of massive sandstone as well as low angle parallel and.

Laminated sandstone facies. Being channel confined exposure width of the iiic facies bodies does not exceed 3 m and their thicknesses range up to 22 cm. The six sequences are named after promi nent sandstone units and include in ascending order upper sego sequence neslen sequence corcoran sequence buck. The pebbles generally concentrate along foreset bases and cross set boundaries. The laminated sandstone facies is indistinguishable from other sandstones on well logs due to resolution limits of gamma ray and neutron logs.

Planar lamination as well as the bedding of fine to medium grained sandstone with fugichnia in the middle shoreface facies. Parallel laminated sandstone sl this facies is composed of dominantly thinly parallel laminated very fine grained sandstone. Unit forms upward fining sequences 0 5 to 2 5 m 1 6 8 ft thick. Glauconite is present in this facies.

1 intercalated intervals of cross stratified muddy sandstone b and laminated to bioturbated and burrowed mudstone c. Facies based on sedimentary structures. Fine grained sandstone lacking cross stratification but with abundant burrows. Fa 4 mainly consists of massive to parallel laminated fm fl and contains interbedded dark grey reddish brown or carbonaceous mudstones and light grey silty sandstone.

Unit is planar to low angle trough cross laminated burrowed and contains local pebble layers. Shale facies can be described as having three variations. Some of the finely laminated units display features which resemble hummocky cross stratification. The cross stratified facies iiib is generally overlain by the dominant planar laminated sandstone fig.

Planolites trace fossils above the carbargillite silt lamination. Figure 2 08 polished core section of laminated muddy sandstone facies. Ferruginous shale pyritic shale and micaceous shale. Geologic unit mapped in new jersey.

Facies and sequence stratigraphic analysis identifies six high resolution sequences within upper campanian strata across about 120 miles of the book cliffs in western colorado and eastern utah. Conglomeratic sandstone jtrpsc is brownish red pebble conglomerate medium to coarse grained feldspathic sandstone and micaceous siltstone. Fine grained sandstone with current ripple cross lamination. C the rippled laminated sandstone mudstone heterolithic bedding with coarsening upward beds reverse grading bidirectional laminations and ripples crest eroded by parallel laminated fine grained sandstone bed.