|Latitude & Longitude (WGS84):||17° 56' 53'' South , 124° 47' 10'' East|
|Latitude & Longitude (decimal):||-17.94799,124.78613|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
Located 90 kilometres west north-west of Fitzroy crossing, the field covers 50 square kilometres, with the Great Northern Highway cutting through it. Minor amounts of diamonds have been found. The field comprises a small group of lamproite intrusions, within a few kilometres of the homestead. All but one is concealed by overburden.
The largest pipe is called Calwynyardah 1 covering 124 Ha, of almost entirely pyroclastic material, intruded by thin lamproite sills, and small plugs. Despite extensive bulk sampling of this intrusion, it yielded only one small diamond and 34 microdiamonds.
The field contains seven leucite lamproite vents. Together with nearby Laymans Bore East, they contain the only known crater lake deposits of epiclastic tuff, interbedded with a thin lignite horizon, the source states. Most of the sites are pyroclastic filled, and only a few have magmatic sills, and small plugs.
1 valid mineral.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Quaternary - Cenozoic|
0 - 66 Ma
Age: Cenozoic (0 - 66 Ma)
Description: Reworked or incised alluvium in older stream channels; alluvial terraces above younger alluvium; alluvial and colluvial outwash deposits not in defined channel systems; lateritised alluvium; sand, silt, gravel, clay, evaporites
Comments: regolith; synthesis of multiple published descriptions
Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). 
201.3 - 252.17 Ma
|Mesozoic sedimentary rocks|
Age: Triassic (201.3 - 252.17 Ma)
Comments: Canning Basin
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.