Thesis (Ph. D.)--University of Wisconsin--Madison, 1946. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [155]-157).

The revised age models for the upper Oligocene to middle Miocene interval of the Marion Plateau have been used to identify eleven sequence boundaries and sequences sets at the Marion Plateau; MSA1.2 (23.1 Ma), MSA1.4 (22.1 Ma), MSA2.1 (21.2 Ma), MSB1.1 (18.4 Ma), MSB1.2 (17.3 Ma), MSB2.1 (16.5 Ma), MSB2.2 (15.6 Ma), MSB2.3 (14.8 Ma), MSB3.1 (13.6 Ma), MSB3.2 (12.9 Ma), and MSB3.3 (11.8 Ma). The complementary Miocene oxygen isotope events Mi1, Mi1a, Mi1aa, Mi2, Mi2b, Mi3a, Mi3, Mi4, Mi5a, Mi5, and Mi6 are recognized in the Marion Plateau sequences. In addition correlation to sequences on the New Jersey margin, the Gulf of Papua, Great Australian Bight, and McMurdo Sound Antarctica indicate that these sequences are controlled by glacio-eustasy, primarily the increase of ice volume on Antarctica. Changes in the preservation, assemblage structure and diversity of calcareous nannofossils as well as %planktic foraminifera, %neritics coincide with transgressive phases and sequence boundaries. The principles of `highstand shedding' are illustrated at the Marion Plateau by enhanced preservation of calcareous nannofossil, deposition of glauconite, unconformities and condensed intervals associated with early to middle Miocene sequence boundaries. Variations in surface water nutrient and temperature conditions at the Marion Plateau throughout the Miocene coincide with climatic events of the early Miocene (23 – 17 Ma), the Middle Miocene Climatic Optimum (17.6 – 15.4 Ma), and Middle Miocene Climatic Transition (14.8 – 13.8 Ma), and the stepwise growth of ice sheets on Antarctica. Calcareous nannofossil communities show evidence for precessional and eccentricity orbital forcing during the Middle Miocene Climatic Optimum, as well as a significantly cooler surface water mass at the Marion Plateau coinciding with the onset of the Middle Miocene Climatic Transition and Mi3a (14.8 Ma) glacial event. Changes in surface water fertility and temperature during the Middle Miocene Climatic Optimum agree with other studies that posit growth of significant ice volume on Antarctica starting as early as ∼17.35 Ma. Further evidence for significant cooling at the Mi3a (14.8 Ma) glacial event agrees with studies suggesting a step-wise cooling for the formation of a semi- permanent Antarctic ice sheet and thermohaline circulation, starting first at 14.8 Ma (Mi3a) and intensifying at 13.9 Ma (Mi3).

The Lower Mystic Lake (Medford/Arlington, MA) is a 24 m deep, ectogenically meromictic, low elevation (1 m a.s.l.), coastal lake directly connected to Boston Harbor by the Mystic River. About 1,000 years ago, steadily rising sea level in the Boston area finally reached a point at which occasional marine water delivery events via the river channel could actually reach the lake basin. Since then, such events have continued with enough frequency to maintain the meromictic condition. Meromixis has allowed the Lower Mystic Lake to accumulate an exquisitely laminated, annually resolvable (i.e. varved) archive of sedimentation in the lake over the last 1,000 years. A varve chronology was developed from this record. Multiple lines of robust evidence verify and validate the accuracy of the chronology. A series of anomalous, graded beds was found in the stratigraphy, and they show excellent coordination with known historic hurricanes that have affected the Boston area. The graded beds appear to be the result of intense, hurricane-strength rains which cause erosive overland flow that entrains sediment which is carried into the lake where it is deposited as a graded bed. This is enhanced by hurricane-strength winds which disturb vegetation, and uproot trees to expose fresh, loose sediment. By analogy, similar graded beds in the prehistoric portion of the stratigraphy probably represent similar hurricane events. This record of hurricane activity was compared to a record of sand layers in nearby Belle Isle Marsh (Boston Harbor) which are presumably the result of storm surge overwash events. Such sand layers in low resolution coastal archives are the main form of proxy evidence that paleotempestology studies have used to piece together longer term records of hurricane activity. Even when using multiple techniques, chronologic control in such archives is difficult, and linking sand layers to any particular storm is only tentative at best. Importantly, the Belle Isle Marsh record shows an apparent 600-year quiescent period. However, this is not due to a lack of hurricanes or storms, but to an unknown geomorphic change which affected the marsh, and it therefore serves as a cautionary note for the use of such archives.

Inaug.-Diss.--Göttingen. / Lebenslauf. Bibliography: p. 58-60.

Thesis (Ph. D.)--University of Michigan, 1933. / Cover title. "Selected references": p. 454-455.

Thesis (Ph. D.)--University of Michigan, 1933. / Cover title. Thesis note on label attached to p. 1785. From Bulletin of the Geological society of America, v. 48, December 1, 1937. Bibliography: p. 1850-1851.

Thesis (Ph. D.)--Johns Hopkins University, 1924. / Vita (on inside of back cover). U.S. Geological survey, Professional paper 143.

The Calama and eastern Pampa del Tamarugal Basins are located between 22°S and 23°S within the forearc of northern Chile. They are filled by sediments deposited in alluvial braidplain, fluvial, playa sandflat, lacustrine and volcaniclastic environments under a semi-arid to hyper-arid climate. The nature of the alluvial braidplain depositional environment is unusual in that it combines elements of both alluvial fan and fluvial depositional systems, in contradiction to recently published models of alluvial fan sedimentation. Detailed sedimentary logging, magnetostratigraphy and dating of 14 volcanic interbeds by the ⁴⁰Ar/³⁹Ar laser fusion method has established a lithostratigraphic and chronostratigraphic framework for the 700 m thick basin-fill. Basin formation was investigated by regional subsidence during the Late Eocene or Early Oligocene, followed by widespread alluvial braidplain deposition during the Oligocene(?). A change to fluvial and playa sandflat deposition during the Early to Mid-Miocene is considered to be coincident with a decrease in active subsidence. Sedimentation ceased and thick (25 m) gypcrete deposits developed along the eastern margin of the basin during the Mid-Miocene as a response to an increasingly arid climate. Phases of minor lacustrine, fluvial and alluvial braidplain deposition during the Late Miocene-Early-Pliocene and the Late Pliocene(?) to Pleistocene were primarily controlled by small-scale fault movements and folding events, although climatic variations may have been important in some cases. A new lithostratigraphic division of the basin-fill is proposed here, which comprises 13 different formations. The previously defined El Loa Formation comprises a number of depositional units which are spatially and temporally discrete formations, and is therefore awarded group status.

Thesis--John Hopkins University. Without thesis statement. / Bibliography: 186-188. Also available in electronic format.

Inaug.-Diss.--Göttingen. / Lebenslauf. Bibliography: p. 58-60.