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・ Ichthyosauridae
・ Ichthyosauriformes
・ Ichthyosauromorpha
・ Ichthyosaurus
・ Ichthyosaurus anningae
・ Ichthyosaurus posthumus
・ Ichthyosis
・ Ichthyosis acquisita
・ Ichthyosis bullosa of Siemens
・ Ichthyosis follicularis with alopecia and photophobia syndrome
・ Ichthyosis hystrix
・ Ichthyosis linearis circumflexa
・ Ichnites
・ Ichnocarpus
・ Ichnocarpus frutescens
Ichnofabric index
・ Ichnofacies
・ Ichnofauna
・ Ichnography
・ Ichnology
・ Ichnomancy
・ Ichnomylax
・ Ichnotaxon
・ Ichnotropis
・ Ichnotropis capensis
・ Ichnotropis grandiceps
・ Ichnotropis microlepidota
・ Ichnotropis squamulosa
・ Ichnovirus
・ Ichnusomunda


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Ichnofabric index : ウィキペディア英語版
Ichnofabric index
The Droser-Bottjer ichnofabric index is a method used to quantify the degree of bioturbation in a sedimentary rock. It involves grading the amount of trace fossil activity on a scale of 1–6; a value of 1 indicates that bioturbation is entirely absent, whereas the highest grade would involve a bedding plane containing over 60% trace fossil cover. This index can be applied in either a vertical or horizontal aspect. The vertical component provides an indication of the interplay between physical and chemical aspects of the environment and the degree of biological activity. The vertical ichnofossil index is harder to measure; it involves quantifying the amount of disturbance to the original sedimentary fabric.
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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