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Science 28 June 2002:
Vol. 296. no. 5577, pp. 2383 - 2386
DOI: 10.1126/science.1071599
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Reports
Proterozoic Modular Biomineralized Metazoan from the Nama Group, Namibia
Rachel A. Wood,12*
John P. Grotzinger,3
J. A. D. Dickson2
We describe a Proterozoic, fully biomineralized metazoan from
the Omkyk Member (~549 million years before the present) of the
northern Nama Group, Namibia. Namapoikia rietoogensis gen. et sp. nov. is up to 1 meter in diameter and bears a complex and robust
biomineralized skeleton; it probably represents a cnidarian or
poriferan. Namapoikia encrusts perpendicular to the walls of vertical synsedimentary fissures in microbial reefs. This finding implies that large, modular metazoans with biologically controlled mineralization appeared some 15 million years earlier than previously documented.
1 Schlumberger Cambridge Research, High Cross,
Madingley Road, Cambridge CB2 OEL, UK.
2 Department
of Earth Sciences, University of Cambridge, Downing Street, Cambridge
CB2 3EQ, UK.
3 Department of Earth, Atmospheric, and
Planetary Sciences, Massachusetts Institute of Technology, Cambridge,
MA 02139, USA.
*
To whom correspondence should be addressed. E-mail:
rwood2{at}cambridge.scr.slb.com
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