| 翻訳と辞書 |
Monte Bolca
Monte Bolca is a lagerstätte near Verona, Italy that was one of the first fossil sites with high quality preservation known to Europeans, and is still an important source of fossils from the Eocene.
==Geology==
Monte Bolca was uplifted from the Tethys Ocean floor during the formation of the Alps, in two stages: one 24 million years ago, and one between 30 and 50 million years ago. The entire formation consists of of limestone, all of which contain fossils, but interspersed in which are the lagerstätte layers that contain the highly preserved specimens.
Within these layers, the fish and other specimens are so highly preserved that their organs are often completely preserved in fossil form, and even the skin color〔Williams, Matt, (Taphonomy of Monte Bolca ), University of Bristol〕 can sometimes be determined.〔Bellwood D.R., (The Eocene fishes of Monte Bolca: the earliest coral reef fish assemblage ), Coral Reefs 15, Springer-Verlag 1996, pages 11-19〕 The normal rearrangement of the specimens caused by mud-dwelling organisms in the layer before it turned to stone has been avoided—it is assumed that the mud in question was low in oxygen, preventing both decay and the mixing action of scavengers.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Monte Bolca」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|