algal limestone

algal limestone

[′al·gəl ′līm‚stōn]
(petrology)
A type of limestone either formed from the remains of calcium-secreting algae or formed when algae bind together the fragments of other lime-secreting organisms.
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In the lower part matrix-rich algal limestone with chert nodules was deposited in moderate to low energy shallow subtidal setting and the overlying algal laminated micritic dolomite was deposited probably in an intertidal environment.
One sample example is a thin slice of an algal limestone from the Strimbes Formation in Greece, courtesy of Antony Burnham, a postdoctoral researcher in the School of Earth Sciences at the Univ.
However, no kinematic indicators were observed and the fabrics were found to be those typical of undeformed algal limestone rather than calc-mylonite.
Chalcosine mineralisation in this place is found in the cement which binds fragments of marborized algal limestones interbedded with thin horizons of lapilli tuffs and volcanic ashes.