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Gap Sandstone STRATNO: 6993
Current: Yes Rank: Formation, beds Status: Formal State(s): NSW
Category: Resvd name published Usage: Defined Definition Card: Yes (View definition data)
Originator: Bembrick, C.S., Robertson Research (Australia) Pty Ltd Entry date: 01-JAN-88 Last Update: 20-DEC-11
Replaced by: Previously known as:
Description: Lithic, medium-grained sandstone.
Comments: Wallerawang Subgroup, Illawarra Coal Measures.
Geological province: No province information available
Type state: NSW Reference section type:
Maximum thickness: 13m Minimum thickness:
Unit Age
Top of unit -
Minimum age: Late Permian Ma: % from base of biozone: Age method:
Maximum age: Ma: % from base of biozone: Age method:
Base of unit -
Minimum age: Ma: % from base of biozone: Age method:
Maximum age: Late Permian Ma: % from base of biozone: Age method:

Stratigraphic Hierarchy (current units only) Rank Status

Chemical Hierarchy (current units only) Rank Status


Related units: Relationship: Contact Type:
Farmers Creek Formation overlies Gap Sandstone conformity
State Mine Creek Formation underlies Gap Sandstone unconformity
Angus Place Sandstone underlies Gap Sandstone unconformity
First Reference:
REFID: 44026 Jorgenson, J.T., Barton, R.H., 1966, Regional photogeology of the Ipswich Basin-Esk Trough, Queensland., APEA Journal, Vol 6 1966, p121-125

Use on maps:


Full Bibliographic Details (ordered by usage, publication year)

REFID: 68004 Hill, M. , McEvilly, R. , Watkins, J. 2002 Mineral and petroleum resources and potential: NSW Western Regional Assessments: Brigalow Belt South Bioregion (Stage 2) Geological Survey of New South Wales 235pp
Usage: Described (p60 Table 6, p62.) Min age from reference: Late Permian Max age from reference: Late Permian Comments: Western Coalfield. Usually 3 to 5 m thick; 11 m in Wilpinjong area. Locally, truncates the entire State Mine Creek Formation and part or all of the underlying Watts Sandstone. , Unit in Wallerawang Subgroup. , Overlies State Mine Creek Formation. Is overlain by Middle River Coal Member. , Off-white, upward-fining, medium- to coarse-grained, high-angle cross-bedded quartz-lithic to lithic sandstone with a pebbly base.
REFID: 42657 Yoo, E.K. 1993 Stratigraphic and coal seam correlations of the Illawarra Coal Measures in the Ulan and Bylong areas, Western Coalfield, Sydney Basin, New South Wales Royal Society of New South Wales. Journal and Proceedings 126(1/2) p73-86
Usage: Described (p84) Comments:
REFID: 39232 Bembrick, C.S. 1983 Stratigraphy and sedimentation of the Late Permian Illawarra Coal Measures in the Western Coalfield, Sydney Basin, New South Wales. Royal Society of New South Wales. Journal and Proceedings 116(3/4) p105-117
Usage: Described (p110) Comments:
REFID: 22857 Scheibner, E. , Basden, H. (ed.) 1998 Geology of New South Wales - Synthesis. Volume 2 Geological Evolution. Geological Survey of New South Wales. Memoir (Geology) 13(2) 666pp
Usage: Briefly described (p528 App.1 Tb.A1.9) Min age from reference: Late Permian Max age from reference: Late Permian Comments: Of the Wallerawang Subgroup (Illawarra Coal Measures). Lithic, medium-grained sandstone. Max. thickness: 13m. Geological Province: Sydney Basin.
REFID: 43194 Tadros, N.Z. 1993 The Gunnedah Basin, New South Wales. Geological Survey of New South Wales. Memoir (Geology) 12 649p
Usage: Briefly described (p115) Min age from reference: Late Permian Max age from reference: Late Permian Comments: Of Wallerawang Subgroup, Illawarra Coal Measures, western Sydney Basin. Loosely correlated with the 'lithic conglomeratic unit' (now Wallala Formation) of the Black Jack Formation (now Black Jack Group), Gunnedah Basin.
REFID: 43146 Dove, A. , Lee, G. 1994 Breccia filled Diatreme in Permian Illawarra Coal Measures and Triassic Strata,Kandos,New South Wales Royal Society of New South Wales. Journal and Proceedings 127 (1-2) 39-45
Usage: Mentioned (Fig.2 p41) Comments: of Illawarra Coal Measures.
REFID: 40332 Martin, D.J. 1986 Sedimentary depositional environments and some igneous intrusions in the Sydney-Gunnedah Basin. Geological Society of Australia. Coal Geology Group. Journal 6 p19-25
Usage: Mentioned (Fig.4) Comments:
REFID: 44026 Jorgenson, J.T. , Barton, R.H. 1966 Regional photogeology of the Ipswich Basin-Esk Trough, Queensland. APEA Journal Vol 6 1966 p121-125
Usage: Not recorded (p123) Max age from reference: Jurassic Comments: Ref. to Wilson 1958,1960 unpubl.(invalid)

Bibliographic references returned: 8 This data is subject to Geoscience Australia's disclaimer and copyright statements.