Mount Sedgwick is a

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher ...

located within the

West Coast Range The West Coast Range is a mountain range located in the West Coast region of Tasmania, Australia. The range lies to the west and north of the main parts of the Franklin-Gordon Wild Rivers National Park. The range has had a significant nu ...

, in the West Coast region of

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

, Australia. It lies in line behind Mount Lyell in views from high points in Queenstown and from the roads leading out to Strahan and

Zeehan Zeehan is a town on the west coast of Tasmania, Australia south-west of Burnie. It is part of the West Coast Council, along with the seaport Strahan, and neighbouring mining towns of Dundas, Rosebery and Queenstown. History The greater ...

. Bands of the pink and grey coloured conglomerate show strikingly on its south west slopes. Its western and south western slopes are significantly more precipitous and rocky, compared to the once heavily forested southern and south eastern slopes.

Geology

The geology of Mount Sedgwick has remnant

Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleo ...

and

Palaeozoic The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and '' ...

features. The top of Mount Sedgwick is columnar jointed Jurassic

Dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grain ...

interpreted as a remnant of a dolerite sheet. The lack of a strong magnetic signature suggests it is not a plug that intrudes Permian tillite, which is exposed on the South East flank of the mountain. Mount Sedgwick and its surrounding area was identified in the 1890s by Thomas Bather Moore as being associated with evidence of glaciation in the West Coast Range.

Access and features

Lake Margaret lies at the northern side of the mountain, while

Lake Beatrice Lake Beatrice is a natural lake on the lower eastern side of Mount Sedgwick in the West Coast Range of Western Tasmania, Australia. Lake Beatrice is higher in altitude than the nearby Lake Burbury; however, it is not visible from that level, ...

and

Lake Burbury Lake Burbury is a man-made water reservoir created by the Crotty Dam inundating the upper King River valley that lies east of the West Coast Range. Discharge from the reservoir feeds the John Butters Hydroelectric Power Station, owned and op ...

at the eastern side. Mount Geikie and the

Tyndall Range The Tyndall Range, commonly called ''The Tyndalls'', is a mountain range that is part of the West Coast Range located in the Western region of Tasmania, Australia. The main focal point for the range is Mount Tyndall which lies at the northern ...

are the main mountains in the West Coast Range to the north. Mount Sedgwick is effectively the source of the Lake Margaret water - with smaller named lakes above Lake Margaret as feeders.

Geology

Access and features

See also

References

Further reading