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GEOREF RECORD

Magnetite in denticle capping in recent chitons (Polyplacophora)

Heinz A. Lowenstam
Magnetite in denticle capping in recent chitons (Polyplacophora)
Geological Society of America Bulletin (1962) 73 (4): 435-438

Abstract

Preliminary data are presented on the physical properties and the mineralogy of the material in denticle caps of chitons. The X-ray diffraction patterns of the denticle material indicate the presence of magnetite, or possibly maghemite. This is the first indication that magnetite or possibly maghemite is precipitated by a biologic agent in sea water. Hence, the origin of magnetite reported in recent and fossil marine deposits will have to be re-examined. The hardness of the denticle material (Ca. 6 on the Mohs scale) explains why chitons are effective erosional agents of rock surfaces, particularly of limestone. From the biologic point of view the possibility is considered that the magnetic properties of the denticle caps may serve as a guidance system for the so-called homing instinct of chitons.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 73
Serial Issue: 4
Title: Magnetite in denticle capping in recent chitons (Polyplacophora)
Author(s): Lowenstam, Heinz A.
Pages: 435-438
Published: 1962
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1962-011111
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1962
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