Voorbeelden van sandstone

• A package of impure fine sandstone with poorly developed bedding follows in the succession.

• As a result, joints that traverse impermeable deformation band shear zones may provide the primary pathways for fluid flow in sandstones compartmentalized by these zones.

• Numerous thin sandstone beds (in general about 10 cm thick) are separated by thicker units of flaser-bedded siltstones and mudstones.

• Incubation vessels inside the chamber were filled with sterile sand, inoculated with crushed sandstone-based biofilms and allowed to incubate for 5.5 months.

• The c. 25 m of purple, fine-grained sandstones below include quartz-arenitic intercalations and have an essentially calcareous matrix.

• In the channel casts, the sandstone packages are separated by oscillation wave ripples and microbial structures.

• The sharp-based sandstones with traction-generated internal sedimentary structures represent storm eventbeds emplaced by episodic storm-generated currents.

• Some conglomerates contain thin (< 10 cm) lenses of sandstone.

• These conglomerates are composed of clasts of basalt, volcaniclastic sandstone, alkaline lava and sub-rounded chert.

• This consists of coarse-grained sandstones with frequent pebbles or thin interbeds of small pebble conglomerates.

• This second phase of electron microscopy was carried out to determine accurate percentages of each mineral phase present in the different sandstones.

• This facies occurs as beds of coarse or medium to fine, normally graded sandstone between 0.3 and 1.0 m thick.

• Interbedded thin fine-grained sandstone and siltstone layers are laminated and wavy in nature.

• The siltstones commonly contain detrital white mica flakes that are generally lacking in the sandstones, and are possibly of distal continental origin.

• The sandstones are the more reliable indicators of the state of evolution of arcs of this type, as they represent near-source deposition.