Número de Documento     
Artículo:

New and Ancient Trace Makers

Autor:

Stefan Bengtson

Resumen:

Trace fossils that are older than known animal fossils may have been formed by large unicellular organisms such as amoebas

Página:

346

Sección:

Perspectives

Publicación:

Science

Volúmen:

323

Número:

5912

Fecha:

16 January 2009

ISSN:

00368075

SrcID:

00368075-2009-01-16.txt

Número de Documento