Location
Brimbank Park (coordinates 37.7340° S, 144.8370° E) is located in the Maribyrnong Valley (hollowed by the Maribyrnong River), near the Melbourne suburb Keilor. It is intersected by the Maribynong River and the M80 highway, which reveals the adaptive nature of the natural environment in a growing urban area. (Parks Victoria, 2013)
Figure 1: Map of Brimbank Park (Google Maps, 2014)
Geology
Brimbank Park consists mainly of sedimentary rock, due to its close proximity to the Maribyrnong River. Along the banks, alluvial deposits and terrace sediments arise from the Quaternary Period (Geological map of Victoria, 1973). Although there is a distinct lack of igneous rock in area, the sediments from primary igneous rock upstream have weathered and been carried downstream onto the river banks. This process has been accelerated due to the water in the ecosystem.
Sedimentary rock from the older Silurian Period is further from the river banks (Geological map of Victoria, 1973). Mudstone, inter-bedded shale and greywacke depositions indicate the Maribyrnong River may have previously taken a different shape, and younger sediments have replaced the older sediments in more recent geological periods.
The third alluvial deposition consists of sand, silt and minor inter-bedded gravel, and again indicates Brimbank Park’s changing geology over time. (Geological map of Victoria, 1973). These deposits, as well as a nearby fault suggest volcanic activity 5-1.6 million years ago, which explains the olivine basalt (fig. 2) deposits which date back to to the Silurian and Tertiary period.
Figure 2: Olivine basalt (Uncyclomedia commons. (2006))
Figure 3: Geology of Brimbank Park (Department of Primary Industries, 2012)
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... from:
http://www.birdsinbackyards.net/species/Malurus-cyaneus
Frogs of Australia. (n.d) Growling Grass Frog. Retrieved from:
http://frogs.org.au/frogs/species/Litoria/raniformis/
Brimbank City Council (2012) Brimbank Biodiversity Strategy 2012-2022 Retrieved:
http://mapshare2.dse.vic.gov.au/output/map30948.pdf acessed 06/04/14
Parks Victoria (2005) Brimbank Park Nature Trail. Retrieved from:
http://parkweb.vic.gov.au/__data/assets/pdf_file/0009/314487/Park-note-Brimbank-Park-nature-trail.pdf
Human Impact
Weekend Notes (2011) Brimbank Park. Retrieved from:
http://www.weekendnotes.com/brimbank-park/
Keilor Historical Society (1990) Retrieved from:
http://home.vicnet.net.au/~khis/keilor_overview.html,
Brimbank City Council (2012) Brimbank Biodiversity Strategy 2012-2022 Retrieved from:
http://mapshare2.dse.vic.gov.au/output/map30948.pdf
Mikculic, D. G., Sargent, M. L., Norby, R. D., and Kolata, D. R., 1985, Silurian Geology of the Des Plaines River Valley, Northeastern Illinois, Illinois State Geological Survey Guidebook 17, 56p.
The Kimmeridge Clay Formation is the penultimate formation of the onshore British Jurrasic Succession. William Smith was the first to document this distinct formation on his map of 1815, and to name as the Oaktree Soil. In 1817, he gave the name Oaktree Clay for the layers of clay between the “Portland Rock” and “Coral Rag and Pisolite” but in 1816 Webster was the first to describe in details the formation and changed to the name now known as kimmeridge Clay Formation after the English village of Kimmeridge on Dorset’s “Jurassic Coast” a place frequently visited by fossil hunters. (Cox and Gallois, 1981).
The purpose of this paper is to explain and highlight different aspects of the Powder River Basin to include paleogeography, stratigraphy, maturation history of organic material, vitrinite reflectance data, sulfur content, both historical and current production data, as well as the environmental impact in the basin.
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Newman, B., 2012. Australian Regolith and Clays Conference. River Murray Salinity Management and Irrigation, pp. 163 - 166.
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