Tecidos moles não resistentes

Tecidos moles (não resistentes): como se fossilizam?
ARTIGO

TERRÆ DIDATICA 10:2-13 2013

Tecidos moles (não resistentes): como se fossilizam?
Silvia Regina Gobbo
Faculdade Ciências Exatas e da Natureza, Univ.
Metodista, Piracicaba, SP.

[e-mail];
Reinaldo J. Bertini
Depto. Geologia Aplicada, Inst. Geociências e
Ciências Exatas, Unesp Rio Claro, SP.

[e-mail]

ABSTRACT
SOFT TISSUES: HOW DO THEY FOSSILIZE? The preservation of soft tissue (not resistant) always draws attention, both for the quality of the fossils preserved, as for their rarity. This contribution makes extensive review of the subject and dispels some myths about the current fossilization of such materials, including anaerobiosis, quick burial.
Additionally it also demonstrates the important role of replacement morphological structures by microbial colonies. Among the factors that influence the preservation of not resistant tissues are pH, decomposition processes, rapid burial and rapid mineralization by carbonates or phosphates. It is possible to cite examples of sedimentary facies in which there is preservation of non resistant tissues as pyrobituminous shales, lithographic limestones, shales and diatomites. Note the role of microbial colonies, both in the form of microspheres, as those non-spherulitic. The three main myths that have been sought to be clarified in the article are: (1) the presence of oxygen, (2) the rapid burial and (3) the microbial colonies. Citation: Gobbo S.R.,
Bertini R.J. 2014. Tecidos moles (não resistentes): como se fossilizam? Terræ Didatica, 10(1):02-13. <http://www.ige.unicamp.br/terraedidatica/>.

KEYWORDS: Taphonomy, fossilization, Paleontology, necrolisis, fossil-lagerstätten
RESUMO
A preservação de tecidos moles (não resistentes) desperta atenção pela qualidade dos fósseis preservados, e pela raridade. Este trabalho faz ampla revisão do assunto, desfaz alguns dos mitos correntes sobre fossilização destes materiais, como anaerobiose e