Skip to Main Content
Book Chapter

Enigmatic fossils from the Upper Silurian of Bolivia: evidence for marine productivity in high-latitude Gondwana

By
D. Edwards
D. Edwards
1
School of Earth and Ocean Sciences
,
Cardiff University
,
Main Building, Park Place, Cardiff CF10 3YE
,
UK
Search for other works by this author on:
L. Axe
L. Axe
1
School of Earth and Ocean Sciences
,
Cardiff University
,
Main Building, Park Place, Cardiff CF10 3YE
,
UK
Search for other works by this author on:
D. G. Poiré
D. G. Poiré
2
Centro de Investigaciones Geológicas
,
Universidad Nacional de La Plata–CONICET
,
calle 1 n. 644, 1900-La Plata
,
Argentina
Search for other works by this author on:
E. M. Morel
E. M. Morel
3
División Científica de Paleobotánica
,
Museo de La Plata and CIC Prov. Bs. Aires
,
Paseo del Bosque s/n, 1900-La Plata
,
Argentina
Search for other works by this author on:
M. G. Bassett
M. G. Bassett
4
Department of Geology
,
National Museum of Wales
,
Cathays Park, Cardiff, CF10 3NP
,
UK
Search for other works by this author on:
C. A. Cingolani
C. A. Cingolani
2
Centro de Investigaciones Geológicas
,
Universidad Nacional de La Plata–CONICET
,
calle 1 n. 644, 1900-La Plata
,
Argentina
Search for other works by this author on:
Published:
January 01, 2009

Abstract

Specimens collected recently from the Las Carmelitas facies of the Kirusillas Formation exposed in the Cochabamba area, Bolivia and dated as Ludlow (Late Silurian) by graptolites, show bedding surfaces almost completely covered by coalified compressions and impressions. The majority comprise mixtures of fragmented amorphous, unidentifiable material (‘debris’), but some horizons are dominated by well-defined morphological entities with a particular type or combination of types confined to a particular layer. In all, five morphotypes have been circumscribed, but their affinities, based on a comprehensive review of the possibilities, remain conjectural. Algal affinities are suggested tentatively for abundant, unbranched, narrow, strap-shaped fossils lacking any further diagnostic features and the numerous coalified discs or three-dimensionally preserved spheres (?leiosphaerid acritarchs) occurring isolated in the matrix or, less often, in clusters. Following a discussion on the recognition of faecal pellets in the fossil record, it is postulated that elliptical, spiral or simply segmented structures may be the excreta of planktonic or benthic metazoans, although the latter seems less likely in view of the proposed anoxic depositional environment of the shales that lack any bioturbation. Such coalified remains, whether from primary producers or grazers, indicate high productivity at high palaeolatitudes in the late Silurian continental seas in this region of peri-Gondwana.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Early Palaeozoic Peri-Gondwana Terranes: New Insights from Tectonics and Biogeography

M. G. Bassett
M. G. Bassett
National Museum of Wales, Cardiff, UK
Search for other works by this author on:
Geological Society of London
Volume
325
ISBN electronic:
9781862395732
Publication date:
January 01, 2009

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal