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1. Calcium carbonate amounts and densities within nodules
2. Thin sections

Cemented tubular sandstone with calcified root mat preservation in thin section (nodule 1) (click image to zoom)	Photomicrograph approximately 400 microns across (plain light, red carbonate stain) showing micrite and minor sparry calcium carbonate cementing silicate-sand grains in nodule 1. (click image to zoom)
Cemented tubular sandstone suggesting horizontal fingered flow (nodule 2) (click image to zoom)	Photomicrograph approximately 400 microns across (plain light, red carbonate stain) showing micrite around grains and sparry calcium carbonate in former pores between silicate-sand grains in nodule 2. (click image to zoom)
Cemented sandstone suggesting anastomosing three-dimensional flow (nodule 3) (click image to zoom)	Photomicrograph approximately 1.2 mm across (plain light, red carbonate stain) showing oriented micrite around grains and sparry calcium carbonate in former pores between silicate-sand grains in nodule 3. Note secondary porosity along edges of some grains. (click image to zoom)
Stage III plugged pedogenic calcium-carbonate horizon. (click image to zoom)	Photomicrograph approximately 400 microns across (plain light, red carbonate stain) showing micrite, clay, and Mn-Fe hydroxides in concentric bands around grains (oolitic calcitans) in Stage III calcium-carbonate horizon. (click image to zoom)

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