Abstract
Thermal demagnetization and chemical leaching experiments show that, in some Hopewell Group sediments, both detrital (DRM) and chemical (CRM) remanent magnetizations are present. The CRM was acquired in two phases (CRM A, CRM B), one before and one after a field reversal. Field evidence indicates that all three magnetizations were probably acquired in less than 35 my. The magnetization process occurred over a period of time long enough to span one or more field reversals. The CRM B and then the CRM A can be successively removed by progressively longer immersion times in hydrochloric acid so that the DRM is uncovered. The oppositely directed CRM A and DRM cannot be thermally separated so that accurate field directions cannot be determined from thermal demagnetization alone. It is suggested that field reversals occurring during magnetization may have a bearing on different paleomagnetic problems. The two techniques of thermal demagnetization and chemical leaching complement each other and together they can provide new information about the behaviour of the earth's field in the past.
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