The fluctuations result in the interbedded layers of sand and mud.

The conglomerate layers occur as interbedded units within the volcanic pile.

The ores are considered to be syn-genetic with the host shale and interbedded volcanic material.

This technique is used to date sequences that generally lack fossils or interbedded igneous rocks.

The layer is characterized by sedimentary breccia and interbedded andesitic lava.

The Stuart Bay Formation is characterized by limestone and interbedded sandstone.

The underlying substrate in the area is sedimentary interbedded shale, sandstone and limestone.

The unit also contains interbedded amphibolites.

The Austin formation consists of recrystalized, fossiliferous, interbedded chalks and marls.

The name is derived from occasional interbedded anthracite layers that indicate a paralic environment near a shallow sea.

It consists of interbedded sands, clays and silts, with discontinuous clay lenses.

Heterolithic bedding is a sedimentary structure made up of interbedded deposits of sand and mud.

This comprises large olistoliths of greywacke sandstone, with interbedded mudstone and siltstone.

The youngest part of the formation consists of interbedded conglomerates and volcanic breccias that are 2 million years old.

Both residual ice caps overlie thick layered deposits of interbedded ice and dust.

In the Oligocene ash flows became the predominate deposit of the area, with interbedded lava flows between.

Down-ramp, the Pooleville is represented largely by centimeter-thick shales and interbedded lime mudstones.

The landmark is a conical outcrop composed of interbedded Permian marine limestone and volcanic rocks.

Noachian terrains consist of overlapping and interbedded ejecta blankets of many old craters.

It is made of bluish-gray shale with interbedded mudstone, fine-grained sandstone and siltstone.

The Mazerolles Schists are aluminous micaschists with interbedded quartzitic layers.

At that time an extremely thick flysch sequence with interbedded bimodal volcanics was laid down in the adjoining ocean to the North.

The division comprises mainly interbedded siltstones and silty sandstones and occurs up to 27m thick.

Cretaceous rocks are composed of basalts and interbedded argillites, sandstones and minor coals.

The concentration of carbon indicates elevated biological productivity levels, possibly due to high levels of nutrients available from interbedded volcanic material.