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2. Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA

Author

Looy, C.V., Stevenson, R.A., Van Hoof, T.B., and Mander, L.

Subjects
Pennsylvanian, Vegetation reconstruction, Energy / Geological Survey Netherlands, Earth / Environmental, Geological Survey Netherlands, Paleoecology, Refugia, ELSS - Earth, Life and Social Sciences, Fossil pollen, Palynology, Geosciences, PG - Petroleum Geosciences
Abstract

The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323-299 Million years ago) dryland vegetation. There is currently no palynological data fromthe same stratigraphic horizons as the plant macrofossils, leaves and other vegetative and reproductive structures, at this locality. Consequently, reconstructions of the standing vegetation at Cottage Grove from these sediments lack the complementary information and a more regional perspective that can be provided by sporomorphs (prepollen, pollen, megaspores and spores). In order to provide this, we have analysed the composition of fossil sporomorph assemblages in two rock samples taken from macrofossil-bearing inter-coal shale at Cottage Grove. Our palynological data differ considerably in composition and in the dominance-diversity profile from the macrofossil vegetation at this locality. Walchian conifers and pteridosperms are common elements in the macroflora, but are absent in the sporomorph assemblages. Reversely, the sporomorph assemblages at Cottage Grove comprise 17 spore taxa (∼16% and ∼63% of the total assemblages) that are known from the lycopsid orders Isoetales, Lepidodendrales and Selaginallales, while Cottage Grove's macrofloral record fails to capture evidence of a considerable population of coal forest lycopsids. We interpret our results as evidence that the Pennsylvanian dryland glacial landscape at Cottage Grove included fragmented populations of wetland plants living in refugia.

Published
2014

7. PROCEEDINGS OF THE TWELFTH ANNUAL CONVENTION.

Author

Bickell, Ralph T., Kohler, E.L., Scovill, H.T., Kester, R.B., Stevenson, R.A., Adams, James P., Meyer, H.G., and Elwell, F.H.

Subjects
ACCOUNTANT societies, CONFERENCES & conventions, CONFERENCE proceedings (Publications), COLLEGE teachers, ACCOUNTING, UNIVERSITIES & colleges, TEACHER organizations
Abstract

The article focuses on the proceedings of the twelfth annual convention of the American Association of University Instructors in Accounting, held at Washington D.C., between December 28 and 29, 1927. After some introductory remarks by the organizers, papers were read by W. W. Nissley of the American Institute of Accountants, John R. Wildman of the company Haskins and Sells, David Himmelblau of Northwestern University, Evanston, Illinois, William A. Paton of the University of Michigan, Ann Arbor, Michigan, and J. L. Dohr of Greene and Hurd and of Columbia University, New York, New York. The second program meeting was given over to a discussion of various features of the federal income tax law. Johns Hopkins University's, Baltimore, Maryland, professor presided at the session and opened it with a brief statement introducing the speakers of the afternoon, all of whom were representatives of the Bureau of Internal Revenue. The third program session consisted of a joint meeting with the American Association of Collegiate Schools of Business. The general topic for discussion was "The Place of Accounting in Commerce Curriculum."

Published
1928

8. Sir Henry Raeburn.

Author

Armstrong, Walter Sir, 1850-1918, Stevenson, R.A, Caw, J.L, M, Armstrong, Walter Sir, 1850-1918, Stevenson, R.A, Caw, J.L, and M

Published
1902

10. Toxic Complications of Pregnancy in Gorgas Hospital, Panama Canal Zone, 1931-1945**Approved for publication by the Research and Publications Committee of the Health Department, The Panama Canal.††The statistical analysis of the data was performed by James Rafferty, M.D., of the Department of Pathology, School of Medicine and Dentistry, University of Rochester.

Author

Scrimshaw, Nevin S., primary, Culver, George A., additional, and Stevenson, R.A., additional

Published
1947
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