Lawrence Rocks
Encyclopedia
The Lawrence Rocks are a group of two rocky islets, 6.8 ha and 1.5 ha in area, with an associated reef, 2.4 km south-east of Point Danger in western Victoria
, Australia
, and about 6 km south-east of the city of Portland
. Geologically, the group is formed from the remnants of an extinct volcano
, with the islets composed of basalt
and tuff
.
and are the site of a breeding colony of Australasian Gannets, the overspill from which led to the establishment of a sister colony at Point Danger. The group has been identified by BirdLife International
as an Important Bird Area
(IBA), because it supports over 10% of the world population of Australasian Gannets, being used by over 6000 birds. Other birds recorded on the rocks, and likely to breed there, include Little Penguin
s, Black-faced Cormorant
s, Crested Terns, Silver Gull
s, Sooty Oystercatcher
s and small numbers of Cape Gannet
s. The rocks are also used as a haul-out site
by Australian Fur Seals.
Victoria (Australia)
Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....
, Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
, and about 6 km south-east of the city of Portland
Portland, Victoria
The city of Portland is the oldest European settlement in what is now the state of Victoria, Australia. It is the main urban centre of the Shire of Glenelg. It is located on Portland Bay.-History:...
. Geologically, the group is formed from the remnants of an extinct volcano
Volcano
2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...
, with the islets composed of basalt
Basalt
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...
and tuff
Tuff
Tuff is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff is sometimes called tufa, particularly when used as construction material, although tufa also refers to a quite different rock. Rock that contains greater than 50% tuff is considered...
.
Fauna
The rocks are protected as a nature reserveNature reserve
A nature reserve is a protected area of importance for wildlife, flora, fauna or features of geological or other special interest, which is reserved and managed for conservation and to provide special opportunities for study or research...
and are the site of a breeding colony of Australasian Gannets, the overspill from which led to the establishment of a sister colony at Point Danger. The group has been identified by BirdLife International
BirdLife International
BirdLife International is a global Partnership of conservation organisations that strives to conserve birds, their habitats and global biodiversity, working with people towards sustainability in the use of natural resources...
as an Important Bird Area
Important Bird Area
An Important Bird Area is an area recognized as being globally important habitat for the conservation of bird populations. Currently there are about 10,000 IBAs worldwide. The program was developed and sites are identified by BirdLife International...
(IBA), because it supports over 10% of the world population of Australasian Gannets, being used by over 6000 birds. Other birds recorded on the rocks, and likely to breed there, include Little Penguin
Little Penguin
The Little Penguin is the smallest species of penguin. The penguin, which usually grows to an average of in height and in length , is found on the coastlines of southern Australia and New Zealand, with possible records from Chile.Apart from Little Penguins, they have several common names...
s, Black-faced Cormorant
Black-faced Cormorant
The Black-faced Cormorant , also known as the Black-faced Shag, is a medium-sized member of the cormorant family. Upperparts, including facial skin and bill, are black, with white underparts. It is endemic to coastal regions of southern Australia.-Ecology:The Black-faced-Cormorant feeds largely on...
s, Crested Terns, Silver Gull
Silver Gull
The Silver Gull also known simply as "seagull" in Australia, is the most common gull seen in Australia. It has been found throughout the continent, but particularly coastal areas. The South African Hartlaub's Gull and the New Zealand Red-billed Gull The Silver Gull (Chroicocephalus...
s, Sooty Oystercatcher
Sooty Oystercatcher
The Sooty Oystercatcher, Haematopus fuliginosus, is a species of oystercatcher. It is a wading bird native to Australia and commonly found on its coastline. It prefers rocky coastlines, but will occasionally live in estuaries....
s and small numbers of Cape Gannet
Cape Gannet
The Cape Gannet, Morus capensis, originally Sula capensis, is a large seabird of the gannet family, Sulidae.They are easily identified by their large size, black and white plumage and distinctive yellow crown and hindneck...
s. The rocks are also used as a haul-out site
Hauling-out
Hauling-out is the behaviour associated with pinnipeds , of temporarily leaving the water between periods of foraging activity for sites on land or ice...
by Australian Fur Seals.