Some remarks concerning syntaxial overgrowth on echinoderm fragments in Middle Triassic limestones

Aleksandra Kostecka

Abstract


Uwagi na temat wzrostu kalcytu w ciągłości optycznej z fragmentami szkarłupni

The author gives some new data concerning the problem of syntaxial overgrowth on echinoderm fragments. These data are as follows:
1) Growth of rim cement around echinoderm plate covered with micrite envelope;
2) Growth of rim cement in intergranular pore spaces and within pelecypod mould infilled with cement crystals;
3) Development of syntaxial rim or rim cement resulting in mammillary appearence; Moreover, growth of neomorphic spar in optical contiunity with echinoderm plate and its rim cement is confirmed. Furthermore, pseudopleochroism of echinoderm plates is briefly described.

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