The Contributions of Donald Lee Johnson to Understanding the Quaternary Geologic and Biogeographic History of the California Channel Islands

Muhs, Daniel R.

doi:10.3398/042.007.0105

Cited by 1 publication

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References 48 publications

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“…Commonly, the lower A horizon and parts of the E and upper Bt horizons host Fe-rich, pea-sized, spherical pisoliths (also called pisolites; see Fig. 9c and d in Muhs 2014 for examples from San Miguel Island). The Bt horizons of the soils have well-developed clay films on prismatic or columnar peds and Bk horizons can be stage IV laminar K horizons (using the terminology of Gile et al 1966).…”

Section: Distribution Of Aeolian Sand and Aeolianite On San Miguel Ismentioning

confidence: 99%

Quaternary sea-level history and the origin of the northernmost coastal aeolianites in the Americas: Channel Islands National Park, California, USA

Muhs

Pigati

Schumann

et al. 2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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Along most of the Pacific Coast of North America, sand dunes are dominantly silicate-rich. On the California Channel Islands, however, dunes are carbonate-rich, due to high productivity offshore and a lack of dilution by silicate minerals. Older sands on the Channel Islands contain enough carbonate to be cemented into aeolianite. Several generations of carbonate aeolianites are present on the California Channel Islands and represent the northernmost Quaternary coastal aeolianites on the Pacific Coast of North America. The oldest aeolianites on the islands may date to the early Pleistocene and thus far have only been found on Santa Cruz Island. Aeolianites with well-developed soils are found on both San Miguel Island and Santa Rosa Island and likely date to the middle Pleistocene. The youngest and best-dated aeolianites are located on San Miguel Island and Santa Rosa Island. These sediments were deposited during the late Pleistocene following the emergence of marine terraces that date to the last interglacial complex (~120,000 yr to~80,000 yr). Based on radiocarbon and luminescence dating, the ages of these units correspond in time with marine isotope stages [MIS] 4, 3, and 2. Sea level was significantly lower than present during all three time periods. Reconstruction of insular paleogeography indicates that large areas to the north and northwest of the islands would have been exposed at these times, providing a ready source of carbonate-rich skeletal sands. These findings differ from a previously held concept that carbonate aeolianites are dominantly an interglacial phenomenon forming during high stands of sea. In contrast, our results are consistent with the findings of other investigators of the past decade who have reported evidence of glacial-age and interstadial-age aeolianites on coastlines of Australia and South Africa. They are also consistent with observations made by Darwin regarding the origin of aeolianites on the island of St. Helena, in the South Atlantic Ocean, more than a century and a half ago.

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Section: Distribution Of Aeolian Sand and Aeolianite On San Miguel Ismentioning

confidence: 99%

Quaternary sea-level history and the origin of the northernmost coastal aeolianites in the Americas: Channel Islands National Park, California, USA

Muhs

Pigati

Schumann

et al. 2018

Palaeogeography, Palaeoclimatology, Palaeoecology

Self Cite

View full text Add to dashboard Cite

show abstract

The Contributions of Donald Lee Johnson to Understanding the Quaternary Geologic and Biogeographic History of the California Channel Islands

Cited by 1 publication

References 48 publications

Quaternary sea-level history and the origin of the northernmost coastal aeolianites in the Americas: Channel Islands National Park, California, USA

Quaternary sea-level history and the origin of the northernmost coastal aeolianites in the Americas: Channel Islands National Park, California, USA

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