A revision of the sedimentary and palynological history of the northeastern Eromanga Basin, Queensland
Titel:
A revision of the sedimentary and palynological history of the northeastern Eromanga Basin, Queensland
Auteur:
Burger, D. Senior, B. R.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 26 (1979) nr. 3-4 pagina's 121-133
Jaar:
1979
Inhoud:
Palynological studies and lithologic interpretations from logged water bores and petroleum exploration wells in the northeastern Eromanga Basin show that: (a) the mid-Jurassic to Lower Cretaceous rock sequence including Hutton Sandstone-Injune Creek Group-Hooray Sandstone is recognised in the southern and western parts of the area previously mapped as Ronlow Beds; (b) these rock units thin northeastwards, where they merge, each in different places, into an apparently indivisible quartzose sandstone unit for which the name Ronlow Beds is retained; (c) the Cadna-owie Formation, which overlies the Hooray Sandstone in the subsurface of the southwestern part of the study area, is missing in a broad zone along the present-day basin margin, where it is thought to have been at least partly eroded: (d) the regional palynological record includes the interval from mid-Jurassic unit J4 to the Early Cretaceous Murospora florida Zone, but is incomplete. Late Jurassic unit J6 is missing, and so are certain Neocomian intervals within the Murospora florida Zone in some areas along the basin margin. These gaps are attributed to faulting, warping, and doming, in part reflecting rejuvenation of basement structures, which affected deposition, particularly along the northeastern margin of the basin, the strongest movements being in Late Jurassic (palynological unit J6) and Early Cretaceous (Foraminisporis asymmetricus Sub-zone) times.
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