Mount York Claystone is a narrow band of

sedimentary rock Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...

s occurring in the Sydney Basin in eastern Australia. This stratum is up to 13 metres thick. Mount York Claystone consists of red brown claystones, of fine‐grained and coarsely oolitic, kaolinite clayrocks. Often seen situated above the

Burra-Moko Head Sandstone Burra-Moko Head Sandstone is a type of sedimentary rock occurring in the Sydney Basin in eastern Australia. This stratum is up to 112 metres thick. The rock is composed of quartzose to quartz lithic sandstone. It is situated below the Mount Y ...

and below the

Banks Wall Sandstone Banks Wall Sandstone is a type of sedimentary rock occurring in the Sydney Basin in eastern Australia. This stratum is up to 115 metres thick. Often seen in the Blue Mountains, such as at the Three Sisters at Katoomba. The rock is mostly q ...

in the cliffs of the Blue Mountains. The line of strata appears as a vegetated horizontal strip. Formed in the

Triassic The Triassic ( ) is a geologic period and system (stratigraphy), system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Year#Abbreviations yr and ya, Mya), to the beginning of the Jurassic Period 201.36 ...

, it is part of the

Narrabeen Group The Narrabeen group of sedimentary rocks occurs in the Sydney Basin in eastern Australia. This series of rocks was formed in the Triassic Period. Geology It includes various rock types including lithic sandstone, quartz sandstone, siltstones, ...

of sedimentary rocks and has similarities to the

Garie Formation The Garie Formation is a narrow band of sedimentary rocks occurring in the Sydney Basin in eastern Australia. This stratum is up to 8 metres thick, situated below the sandstones of the Newport Formation. Formed in the mid-Triassic, it is part of ...

References

Geologic formations of Australia Triassic Australia Shale formations Geology of New South Wales {{Australia-geology-stub

See also

References