The sequence of structural events at this unique, three-dimensional exposure is described in detail. In contrast to previous studies that have suggested collision between India and Asia started in Pakistan between ca. Twenty-nine consecutive lava flows are sampled along cliffs m high generated by normal faulting on the Dobi section of Afar depression, Ethiopia. Tauxe, D. The r adiocarbon dating of charcoal in fire hearths associated with thermoremnant magnetic samples at these sites anchored them in time.
Historical Geology/Absolute dating: an overview
The fact that the chemical magnetization was affected by burial compaction as demonstrated by the inclination shallowing in the site means indicate that the chemical magnetization, despite being secondary in origin, must have been acquired soon after deposition.
The source can be modeled by a radial eccentric dipole at high northern latitudes and pointing outward during the first part of the excursion, and near the equator and pointing inward during the latter part. We can hardly suppose that there is some single mechanism which would interfere with all three of these very different processes in such a way as to leave the dates derived from them still concordant. One advantage of the anisotropy technique is that it relies on measured parameters declinations, inclinations, bulk rock magnetic fabrics and particle magnetic anisotropy that have measurement errors associated with them, rather than relying on a geomagnetic field model and statistical treatment of the data.