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Gyarran Volcanics STRATNO: 26602
Current: Yes Rank: Formation, beds Status: Formal State(s): NSW
Category: Variation of published name Usage: Described Definition Card: No
Originator: Entry date: 01-JAN-88 Last Update: 08-JUL-13
Replaced by: Previously known as: Gyarran volcanics
Description: Rhyolite, acid to basic volcanics and pyroclastics.
Comments: Proposed that Gyarran Volcanics and Skeletar Formation combine to form the Dalwood Group (1994).
Geological province: No quality assured province information available
Type state: Reference section type:
Maximum thickness: 218m Minimum thickness:

Unit Age Event: eruption
Top of unit -
Minimum age: Sakmarian 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: Asselian Ma: % from base of biozone: Age method:

Stratigraphic Hierarchy (current units only): - Rank: - Status:

Chemical Hierarchy (current units only): - Rank: - Status:

  • Gyarran Volcanics- Formation, beds- Formal

Related units: Relationship: Contact Type:
Skeletar Formation overlies Gyarran Volcanics

First Reference:
REFID: 43477 Booker, F.W., 1960, Studies in Permian sedimentation in the Sydney Basin, New South Wales. Department of Mines. Technical Report, 5, pp10-62

Use on maps:
REFID: 39346 Summerhayes, G., 1983, Muswellbrook, New South Wales, 1:25 000 geological map. Sheet 9033-11-N, 1st edition., Geological Survey of New South Wales, 1v
REFID: 43257 Glen, R.A., Beckett, J., 1993, Hunter Coalfield Regional Geology, New South Wales. Department of Mineral Resources, 1v, Map


Full Bibliographic Details (ordered by usage, publication year)

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: Described (p526 App.1 Tb.A1.9) Min age from reference: Permian Max age from reference: Permian Comments: Of the Dalwood Group. Rhyolite, felsic to mafic volcanics, pyroclastics. Max. thickness: >218m. Geological Province: Sydney Basin.
REFID: 22969 Maung, T.U. , Alder, D. , Shaw, R. , Hawley, S. 1997 Offshore Sydney Basin. Box 1 Bureau of Resource Sciences, Petroleum Prospectivity Bulletin
Usage: Described (p 9, Fig 4.1a) Comments:
REFID: 68003 Barnes, R. , Dawson, M. , Spiller, F. 2002 Geology - Integration and upgrade: NSW Western Regional Assessments: Brigalow Belt South Bioregion (Stage 2). A project undertaken for the Resource and Conservation Assessment Council; NSW Western regional assessments Geological Survey of New South Wales WRA / 19 157pp
Usage: Briefly described (p38 Fig.3-j, p40.) Min age from reference: Early Permian Max age from reference: Early Permian Comments: Hunter Coalfield (Sydney Basin), Brigalow Belt South Bioregion. Correlative of Werrie Basalt in Gunnedah and Werrie Basins. Thick volcanic sequence. , Unit in Dalwood Group.
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: Briefly described (p23 Table 1, p51 Table 5.) Comments: Hunter Coalfield. Is coeval with Dalwood Group. Equivalent to Boggabri Volcanics and Werrie Basalt in Gunnedah Basin. , Overlies Seaham Formation. Is overlain by Greta Coal Measures. , Felsic to mafic volcanics and pyroclastics.
REFID: 23350 Boyd, R. , Leckie, D. 2000 Greta Coal Measures in the Muswellbrook Anticline area, New South Wales. Australian Journal of Earth Sciences 47(2) p259-279
Usage: Briefly described (260) Min age from reference: Permian Max age from reference: Permian Comments: Proposed that Gyarran Volcanics and Skeletar Formation combine to form the Dalwood Group (1994).
REFID: 61529 Glen, R.A. , Beckett, J. 1997 Structure and tectonics along the inner edge of a foreland basin: the Hunter Coalfield in the northern Sydney Basin, New South Wales Australian Journal of Earth Sciences 44(6) p853-877
Usage: Briefly described (p854 Fig. 1b) Min age from reference: Early Permian Max age from reference: Early Permian Comments: Of the Dalwood Group. Geological Province: Sydney Basin.
REFID: 61315 New South Wales Department of Mineral Resources 1995 Sydney Basin IN Stewart, R. and Adler, D. (eds.) "New South Wales Wales Petroleum Potential" - Bulletin New South Wales. Department of Mineral Resources. Coal and Petroleum Geology Branch. Bulletin 1 p163-188
Usage: Briefly described (Table SY1) Min age from reference: Early Permian Max age from reference: Early Permian Comments: Of the Dalwood Group. Geological Province: Sydney Basin/Hunter Valley area.
REFID: 43257 Glen, R.A. , Beckett, J. 1993 Hunter Coalfield Regional Geology New South Wales. Department of Mineral Resources 1v Map
Usage: Briefly described (Map Legend) Max age from reference: Early Permian Comments: Of Dalwood Group.
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 (p128, p129 Tb. 8.3) Min age from reference: Early Permian Max age from reference: Early Permian Comments: Hunter region, Sydney Basin. Contains Lochinvar, Allandale, Rutherford and Farley Formations. Equivalent to Dalwood Group in the Newcastle Coalfield and Werrie Basalt and Boggabri Volcanics (Gunnedah Basin).
REFID: 43017 Briggs, D.J.C. 1993 Time control in the Permian of the Sydney-Bowen Basin and the New England Orogen; In Findlay, Unrug, Banks, & Veevers (eds) Gondwana Eight. Assembly, evolution and dispersal. Proceedings of the Eighth Gondwana Symposium, Hobart, Tasmania, A A.A. Balkema, Rotterdam 1v p371-383
Usage: Briefly described (Fig.1,p372) Comments:
REFID: 42925 Jones, D.C. , Clark, N.R. 1991 Geology of the Penrith 1:100 000 sheet 9030. New South Wales. Department of Minerals and Energy 1v 202pp
Usage: Briefly described (Table 1) Max age from reference: Early Permian Comments:
REFID: 42916 New South Wales. Dept. Minerals & Energy 1989 Coalfield Review -- Hunter Coalfield. New South Wales. Department of Minerals and Energy. Minfo 23 p23-29
Usage: Briefly described (Table 1) Max age from reference: Early Permian Comments:
REFID: 37773 Moffitt, R.S. 1982 The 1980 east Muswellbrook coal drilling programme. Geological Survey of New South Wales. Quarterly Notes 47 p17-26
Usage: Briefly described (p18) Comments:
REFID: 31881 Loughnan, F.C. 1973 Kaolinite clayrocks of the Koogah Formation New South Wales. Geological Society of Australia. Journal 20(3) p329-341
Usage: Briefly described (p340) Comments: ? equiv. Werrie Basalts.
REFID: 34445 Rattigan, J.H. 1969 The Sydney Basin - Permian of the Hunter Valley. Dalwood Group. IN Packham G.H.(ed) - The geology of New South Wales. Geological Society of Australia. Journal 16(1) p319-322
Usage: Briefly described (p319) Comments:
REFID: 67663 Danis, C. , O'Neill, C. , Lackie, M. , Twigg, L. , Danis, A. 2011 Deep 3D structure of the Sydney Basin using gravity modelling Australian Journal of Earth Sciences 58(5) 517-542
Usage: Mentioned (p520 Tb.1) Min age from reference: Permian Max age from reference: Permian Comments: Early Permian. , Overlain by the Greta Coal Measures. Overlies Seaham Formation.
REFID: 61791 Brownlow, J.W. 1999 Geological setting and the origin of the Early Permian Boggabri Volcanics, Gunnedah Basin, N.S.W. IN Flood, P. G. (ed.) "Regional Geology Tectonics and Metallogenesis: New England Orogen" - papers presented at a conference .... University of New England, Armidale 1999" - NEO '99 Conference University of New England. Earth Sciences 1v p325-334
Usage: Mentioned (p325) Comments:
REFID: 22601 Roberts, J. , Claoue-Long, J.C. , Foster, C.B. 1996 SHRIMP zircon dating of the Permian System of eastern Australia Australian Journal of Earth Sciences 43(4) 401-421
Usage: Mentioned (409) Min age from reference: Permian Max age from reference: Permian Comments: Geol province Sydney Basin. Overlying unit Skeletar Formation. Previously Skeletar Formation.
REFID: 44244 Roberts, J. , Engel, B. , Chapman, J. 1991 Geology of the Camberwell, Dungog, and Bulahdelah 1:100 000 sheets 9133, 9233, 9333. Geological Survey of New South Wales 1v 382pp
Usage: Mentioned (p232) Min age from reference: Permian Max age from reference: Permian Comments: Underlies Skeletar Formation.
REFID: 41834 Glen, R.A. , Beckett, J. 1989 Geological note. Thin-skinned tectonics in the Hunter Coalfield of New South Wales. Australian Journal of Earth Sciences 36(4) p589-593
Usage: Mentioned (p590) Comments:
REFID: 41689 Middleton, M.F. , Hunt, J.W. 1989 Influence of tectonics on Permian coal-rank patterns in Australia. Coal Journal 13(1-4) p391-411
Usage: Mentioned (Table 1) Comments:
REFID: 41290 Hamilton, D.S. , Newton, C.B. , Smyth, M. , Gilbert, T.D. , Russell, N. , McMinn, A. , Etheridge, L.T. 1988 The petroleum potential of the Gunnedah Basin and overlying Surat Basin sequence, New South Wales. APEA Journal 28(1) p218-241
Usage: Mentioned (Fig.8) Comments:
REFID: 40883 Roberts, J. , Engel, B.A. 1987 Depositional and tectonic history of the southern New England Orogen. Australian Journal of Earth Sciences 34(1) p1-20
Usage: Mentioned (p15) Comments:
REFID: 41054 McMinn, A. 1987 Palynostratigraphy of the Stroud Gloucester Trough, N.S.W. Alcheringa 11(2) p151-164
Usage: Mentioned (Fig.3) Comments:
REFID: 40331 Hamilton, D.S. 1986 Depositional systems and coal seam correlation in the Greta Coal Measures of the Muswellbrook region. Geological Society of Australia. Coal Geology Group. Journal 6 p1-18
Usage: Mentioned (p3) Comments:
REFID: 40246 Harrington, H.J. , Korsch, R.J. 1985 Tectonic model for the Devonian to middle Permian of the New England Orogen. Australian Journal of Earth Sciences 32(2) p163-179
Usage: Mentioned (p173) Comments:
REFID: 39346 Summerhayes, G. 1983 Muswellbrook, New South Wales, 1:25 000 geological map. Sheet 9033-11-N, 1st edition. Geological Survey of New South Wales 1v
Usage: Mentioned (Map legend) Min age from reference: Early Permian Max age from reference: Early Permian Comments:
REFID: 38837 Brownlow, J.W. 1982 Diapirism and the development of four thermal provinces in northeastern New South Wales.IN Flood P.G.,Runnegar B.(eds)-New England geology. Proceedings of symposium on geology of New England area,Armidale Jul.82. University of New England. Department of Geology & AHV Club 1v p229-239
Usage: Mentioned (p232) Comments:
REFID: 39287 Herbert, C. 1980 Depositional development of the Sydney Basin. IN Herbert C., Helby R.(eds) - A guide to the Sydney Basin. Geological Survey of New South Wales. Bulletin 26 p11-52
Usage: Mentioned (Fig. 2.5) Comments:
REFID: 36069 Rose, G. , Probert, D.H. , Ramsland, A.W. 1980 New developments in the Upper Hunter coalfield. Mineral 26(1) p21-25
Usage: Mentioned (p23) Comments:
REFID: 39288 McClung, G. 1980 Permian marine sedimentation in the northern Sydney Basin. IN Herbert C.,Helby R.(eds) - A guide to the Sydney Basin. Geological Survey of New South Wales. Bulletin 26 p54-72
Usage: Mentioned (p57) Comments: See also Fig.3.3
REFID: 36045 Evans, P.R. , Roberts, J. 1979 Evolution of central eastern Australia during the late Palaeozoic and early Mesozoic. Geological Society of Australia. Journal 26(7) p325-340
Usage: Mentioned (p330) Comments:
REFID: 36042 Branagan, D. , Herbert, C. , Langford-Smith, T. 1979 The Sydney Basin. Science Press 1v
Usage: Mentioned (Table 1) Comments:
REFID: 31882 Loughnan, F.C. 1975 Correlatives of the Greta Coal Measures in the Hunter Valley and Gunnedah Basin, New South Wales. Geological Society of Australia. Journal 22(2) p243-253
Usage: Mentioned (p243) Comments:
REFID: 45090 Mayne, S.J. , Nicholas, E. , Bigg-Wither, A.L. , Rasidi, J.S. , Raine, M.J. 1974 Geology the Sydney Basin - a review. Bureau of Mineral Resources, Australia. Bulletin 149 229pp
Usage: Mentioned (p25) Comments: Early Sakmarian. Correlation
REFID: 45088 Roberts, J. , Oversby, B.S. 1974 The Lower Carboniferous geology of the Rouchel district, New South Wales Bureau of Mineral Resources, Australia. Bulletin 147
Usage: Mentioned (p59) Comments: Permain succession
REFID: 31706 Kummel, B. 1970 History of the earth. W.H.Freeman & Co., San Francisco 1v
Usage: Mentioned (p657) Comments: Permian correlation chart.
REFID: 34138 Dickins, J.M. 1969 Correlation chart for the Permian System in Australia. IN Gondwana stratigraphy. Unesco, France 1v p475-477
Usage: Mentioned (Cor.Chart) Comments: Sakmarian
REFID: 34292 Leitch, E.C. 1969 Igneous activity and diastrophism in the Permian of New South Wales. IN Dickens J.M. (ed) The Permian of Australia Symposium. Geological Society of Australia. Special Publication 2 p21-37
Usage: Mentioned (p24) Comments: Permian
REFID: 34015 Basden, H.G. 1969 The Sydney Basin - Permian of the Hunter Valley Greta Coal Measures. IN Packham G.H.(ed) - The geology of New South Wales. Geological Society of Australia. Journal 16(1) p323-329
Usage: Mentioned (p328) Comments:
REFID: 34447 Rattigan, J.H. , McKenzie, P.J. 1969 The Sydney Basin - Permian of the Hunter Valley. IN Packham G.H.(ed) - The geology of New South Wales. Geological Society of Australia. Journal 16(1) p313-319
Usage: Mentioned (Table 5.2) Comments:
REFID: 43479 Brown, D.A. , Campbell, K.S.W. , Crook, K.A.W. 1968 The geological evolution of Australia and New Zealand. Pergamon Press oxford 409pp
Usage: Not recorded (p218) Max age from reference: Artinskian Comments:
REFID: 43440 Nashar, B. 1964 The geology of the Hunter Valley (Possible coal seams to be indexed at a later date) Jacaranda Press p49
Usage: Not recorded (p91,82) Comments: Correlated with Dalwood Group.
REFID: 43477 Booker, F.W. 1960 Studies in Permian sedimentation in the Sydney Basin New South Wales. Department of Mines. Technical Report 5 pp10-62
Usage: Not recorded (p17,28,29,31,35,Pl.3) Comments:

Bibliographic references returned: 44
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