They conclude that carbonate concretionary growth occurs over a depth range from tens to hundreds of metres of burial. |
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Those sections expose concretionary mudstones interbedded with thinner quartz sandstones, limestones, and marl. |
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At Cresson Quarry, the Kiamichi Formation is 10 m thick and comprises silty marls with concretionary limestone lenses and layers and minor beds of fine sandstone. |
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The swirls, which are more siliceous than the surrounding sandstone, weather in relief to produce elliptical to irregular concretionary patterns on the sandstone surface. |
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Towards the top of the shale is a horizon of spherical to ovoid concretionary nodules that reach a maximum thickness of 3 cm. |
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Approximately 20 concretionary masses assumed to be fossil crocodylian feces are found in association. |
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