10.6084/m9.figshare.3452921
George E. Williams
George E.
Williams
Victor A. Gostin
Victor A.
Gostin
David M. McKirdy
David M.
McKirdy
Wolfgang V. Preiss
Wolfgang V.
Preiss
Phillip W. Schmidt
Phillip W.
Schmidt
Chapter 70 The Elatina glaciation (late Cryogenian), South Australia
Geological Society of London
2016
Cryogenian Elatina glaciation
basal boulder diamictite
Yerelina Subgroup
Ediacaran marine transgression
Fm
200 000 km 2
periglacial
Adelaide Geosyncline region
25 000 km 2
SE
Elatina glaciation
aeolian sand sheet
glaciofluvial
South
regolith
Geology
2016-06-21 10:59:26
Dataset
https://geolsoc.figshare.com/articles/dataset/Chapter_70_The_Elatina_glaciation_late_Cryogenian_South_Australia/3452921
<p>Deposits of the late Cryogenian Elatina glaciation constitute the Yerelina Subgroup in the Adelaide Geosyncline region, South
Australia. They have a maximum thickness of <em>c</em>. 1500 m, cover 200 000 km<sup>2</sup>, and include the following facies: basal boulder diamictite with penetrative glaciotectonites affecting preglacial beds;
widespread massive and stratified diamictites containing faceted and striated clasts, some derived from nearby emergent diapiric
islands and others of extrabasinal provenance; laminated siltstone and mudstone with dropstones; tidalites and widespread
glaciofluvial, deltaic to marine-shelf sandstones; a regolith of frost-shattered quartzite breccia up to 20 m thick that contains
primary sand wedges 3+ m deep and other large-scale periglacial forms; and an aeolian sand sheet covering 25 000 km<sup>2</sup> and containing primary sand wedges near its base. These deposits mark a spectrum of settings ranging from permafrost regolith
and periglacial aeolian on the cratonic platform (Stuart Shelf) in the present west, through glaciofluvial, marginal-marine
and inner marine-shelf in the central parts of the Adelaide Geosyncline, to outer marine-shelf in sub-basins in the present
SE and north.
</p> <p>The Elatina glaciation has not been dated directly, and only maximum and minimum age limits of <em>c</em>. 640 and 580 Ma, respectively, are indicated. Palaeomagnetic data for red beds from the Elatina Formation (Fm.) and associated
strata indicate deposition of the Yerelina Subgroup within 10° of the palaeoequator. The Yerelina Subgroup is unconformably
to disconformably overlain by the dolomitic Nuccaleena Fm., which in most places is the lowest unit of the Wilpena Group and
marks Early Ediacaran marine transgression.
</p>