Home
About Me...
Ph.D. Research
Other Research
Tools and Tips
Images
Links
Return to the main UMass Geosciences webpage

[UMass Geosciences Main Page]

Masters Thesis

My Masters thesis was an interesting blend of geology and archaeology--basically, a coastal paleogeographic reconstruction using microfossils (ostracods and forams), sedimentological analyses, and historical references (ancient to modern). It was completed at the University of Minnesota Duluth under Rip Rapp Jr. Immediately below is the thesis abstract, followed by links to the complete thesis in Adobe Acrobat PDF format.  At the base of this page are some of the thesis figures which may be of interest.

    The Middle and Late Holocene Geology and Landscape Evolution of the Lower Acheron River Valley, Epirus, Greece.

    The lower Acheron River Valley, Epirus, Greece, hosts a rich, archaeological heritage dating back to the Lower Palaeolithic (Dakaris, 1971). Beginning with the Odyssey of Homer in the eighth century BC, numerous ancient authors make reference to the valley and describe a landscape configuration that is significantly different from that of the present. Three notable discrepancies concern:

      1.) the size of the Glykys Limen (modern Phanari Bay),
      2.) the nature, geometry, and evolution of the Acherousian lake, and
      3.) the course of the Acheron River with respect to Kastri during the Classical Period.

    Are these ancient authors incorrect in their descriptions of the valley, or can a natural sequence of geomorphic evolution account for such discrepancies? To answer this question, an examination of the changing paleogeography and paleoenvironmental configuration of the valley during the past 4000 years was undertaken. Twenty-eight gouge auger sediment cores were taken from various locations in the valley between 1992 and 1994. Selected sediment samples underwent analyses of microfossil assemblages, organic carbon content, grain-size, magnetic susceptibility, and anhysteretic magnetization. Results from these analyses were used along with stratigraphic data and eight radiocarbon dates to reconstruct the middle and late Holocene paleogeography of the valley. The reconstructions suggest that the accounts given by ancient authors are correct, and that the discrepancies are the result of natural landscape evolution. In fact, the picture that emerges shows that recent geomorphic change in the valley has been quite significant with nearly six kilometers of shoreline progradation having occurred during the last 4,000 years.

Adobe Acrobat PDF Versions:   

The full 173 page thesis including all figures, plates, appendices, etc. is available in high and low resolution versions. The two versions are exactly the same except the quality of the images such as photographs and microfossil plates is better in the higher resolution version. Seven errata made it into the final thesis version, and the corrected pages are included in a small, additional PDF file.

Besonen MSc Thesis 1997.pdf (High resolution version, 17,444,250 bytes)

Besonen MSc Thesis 1997--lowres.pdf (Low resolution version, 2,827,301 bytes)

Besonen MSc Thesis 1997 Errata.pdf (Errata compilation, 206,321 bytes)

Figures: (click thumbnails for larger versions)
 

Area map of the Epirus region

Area map of the Epirus region

Suggested locations of the Acherousian Lake

Suggested locations of the Acherousian lake

Satellite Image of Epirus Region:  The overall structural configuration of Epirus is defined by a series of parallel NNW-SSE trending limestone mountain ranges with intervening flysch basins.  Beautiful, elongate

Satellite image of the Epirus region

Fence diagram of Middle to Lake Holocene stratigraphy in the lower Acheron Valley

Fence diagram of Middle to Late Holocene stratigraphy in the lower Acheron Valley

Some of the fresh to brackish microfossils encountered in sediment cores recovered from the lower Acheron Valley (listed in rows from left to right consecutively downwards: Candona, Potamocypris, Paralimnocythere, Ilyocypris, charophyte, Cyprideis, Loxoconcha, Tyrrhenocythere, Cytheridea, Cytheromorpha, Ammonia, Elphidium

An animated sequence showing the changing landscape configuration in the lower Acheron Valley starting at 2100 B.C.; the small black squares show the locations of the 28 sediment cores

An animated sequence showing the changing landscape configuration in the lower Acheron Valley starting at 2100 B.C.; the small black squares show the locations of the 28 sediment cores