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

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.