Formacja koralowa w malmie Gór Świętokrzyskich
Abstract
CORAL FORMATION OF THE MALM OF THE HOLY CROSS MTS
Summary
The development of coral deposits of the MaIm of the Holy Cross Mts began in the late Middle Oxfordian and continued through the whole Late Oxfordian and a large part of the Early Kimmeridgian. Limestones with agglomerations of hexacorals colonies represent a few meter sections of the profile, intercalated with those without corals. Agglomerations occupy whole layers or form individual bodies in unbedded limestone. As a rule, the sediment infilling interstices of colonies of surrounding the agglomerations is not detrital. It usually represents a multicomponent fine-grained chalky or pelitic limestone. There are two types of colonies most characteristic of the shallow-water environments of corals of the Upper Jurassic of the Holy Cross Mts: disc-shaped and branching and especially compact-branching (fascicular) types. Jurassic corals in comparison with recent ones were growing outside the zone of destructive action of water movement, in the environment of intensive deposition of muddy calcareous deposit. Coral agglomerations were covering the bottom in the form of clumps or wide scrubs.
Summary
The development of coral deposits of the MaIm of the Holy Cross Mts began in the late Middle Oxfordian and continued through the whole Late Oxfordian and a large part of the Early Kimmeridgian. Limestones with agglomerations of hexacorals colonies represent a few meter sections of the profile, intercalated with those without corals. Agglomerations occupy whole layers or form individual bodies in unbedded limestone. As a rule, the sediment infilling interstices of colonies of surrounding the agglomerations is not detrital. It usually represents a multicomponent fine-grained chalky or pelitic limestone. There are two types of colonies most characteristic of the shallow-water environments of corals of the Upper Jurassic of the Holy Cross Mts: disc-shaped and branching and especially compact-branching (fascicular) types. Jurassic corals in comparison with recent ones were growing outside the zone of destructive action of water movement, in the environment of intensive deposition of muddy calcareous deposit. Coral agglomerations were covering the bottom in the form of clumps or wide scrubs.