Journal of the Royal Society of Western Australia, 86(2), June 2003 
Plate 1. A: Nodular sandstone facies of the Westonia Formation showing development of nodules and incipient pisoliths (numbered I- 
V), transitional to Mulline Formation sandy pisolitic duricrust (see photomicrograph below). Nodule and incipient pisolith nuclei are 
composed of coarser quartz grains typical of underlying clayey sand facies of the Westonia Formation, whereas the intervening areas 
are composed of allogenic finer quartz grains arranged into poorly- to well-developed curvilinear laminae around the nuclei. B: Mulline 
Formation sandy pisolitic duricrust developed within the upper part of the Westonia Formation. Inset shows enlarged and rotated view 
of a corroded well-rounded quartz grain (R) in one of the pisolith nuclei. A = sample EY2/2A, B = sample EY 9/1. A,B plane polarised 
light, inset in B cross-polarised light. 
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