Das Alleröd-Interstadial als Leithorizont der letzten Vereisung in Europa und Amerika

Gross, Hugo

doi:10.3285/eg.04-5.1.17

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…This tripartite sequence consisting of organic material sandwiched between two layers of soliflucted inorganic material is typical of Late-glacial sites in north-west Europe and reflects a climatic oscillation in which a phase of amelioration intervened between two periods of climatic severity. The milder Allerod phase, named after the type site in Zealand (Hartz & Milthers 1901), marks the warmest phase of the Gotiglacial Period (Gross 1954) during which the Scandinavian ice sheet retreated across southern Sweden. The tem porary halt at the Fenno-scandian moraines coincides with the ensuing ('Upper Dryas') cold period (Donner 1951).…”

Section: Introductionmentioning

confidence: 99%

Late-glacial deposits at Llyn Dwythwch and Nant Ffrancon, Caernarvonshire

1962

Phil. Trans. R. Soc. Lond. B

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The stratigraphy of sediments in two lake basins in the Caernarvonshire mountains at 600 and 900 ft. O.D. is described and it is shown that the basal layers were deposited in the Late-glacial Period. The deposits of a third site occupying a kettle-hole in morainic gravels at 1223 ft. O.D. are described and here the Late-glacial Period is not represented. The relation of these sites to the youngest corrie moraines of the district indicates that the latter were formed during the post-Allerod climatic regression (Zone III). The vegetation history of the district was studied by means of pollen analysis of lacustrine deposits from the two first-mentioned sites (above). The vegetation of the Late-glacial Period at first formed tundra (Zone I) in which arctic-alpines, notably Betula , flourished together with species of oceanic and oceanic-northern distribution and calcicolous, eutrophic and moderately thermophilous plants. The spread of juniper scrub preceded the arrival of tree birches, which form ‘park-tundra’ in Zone II at Nant Ffrancon but failed to grow as high as Llyn Dwythwch. The birch ‘ parktundra’ is considered to have covered Britain south of the Forth-Clyde at low altitudes and to have occupied central and eastern Ireland at this time. The climatic deterioration of Zone III is clearly registered by the decline of juniper and tree birch and the local severity of conditions is demonstrated by the increased abundance of the chianophilous fern, Cryptogramma crispa, Lycopodium selago, Saussurea alpina and other montane herbs. The extensive occurrence of solifluxion, augmented by glacier streams, brought down silt and clay into the lakes. The ensuing amelioration in climate and the course of forest development through the Post-glacial Period is briefly traced and the persistence of certain elements of the present mountain flora from the Late-glacial Period demonstrated. A description is given of the spores of Cryptogramma crispa which together with Lycopodium annotinum and Saussurea alpina are new to British Late-glacial records.

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Section: Introductionmentioning

confidence: 99%

Late-glacial deposits at Llyn Dwythwch and Nant Ffrancon, Caernarvonshire

1962

Phil. Trans. R. Soc. Lond. B

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“…As shown in table 4, the scales allow for parallelism, if not for strict simultaneity, between events in Europe and those in North America. In the form stated, they rely on the findings of Firbras (1949), Deevey (1949, Gross (1954), Emiliani (1955), Suess (1956), Barendsen, Deevey and Gralenski (1957), Wright (1957), Deevey and Flint (1957), and Fairbridge (1961). The use of a general schema is not meant to prejudice any evdience of opposed or compensatory change according to location, as for instance in northwest Europe as against the Mediterranean ; but, as will appear, considerable similarity seems to be indicated for the main episodes of channeling and filling, respectively, in northwest Europe and in the United States.…”

Section: B27mentioning

confidence: 99%

Subsurface exploration and chronology of underfit streams

Dury¹

1964

Professional Paper

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FIGURE 35. Morphologic sketch map of part of the Mission River, Refugio County, Tex___________________________ B40 36. Profile section showing possible interpretation of sedimentary sequence on the River Dorn, Oxfordshire, England______-____-___-______________________-____-_-_____-_____-__________________ 41 37. Diagrammatic interpretation of the sedimentary sequence on the River Lea at Nazeing, Essex, England___ 41 38. Block diagrams of the filled channel beneath the River Bure, Norfolk, England_________________________ 44 39. Profile section of Willow Brook, Northamptonshire, England.-_______________________________________ 44 40. Map of the Fenland of eastern England, with reconstructed early drainage pattern____________________ 45 41. Profile section of channels, sediments, and archeological correlations in the Fenland of eastern England.___ 46 42. Graph showing relation of wavelength to drainage of the Fenland and adjacent areas____________________ 46 48 4. Correlation table of selected glacial, deglacial, and postglacial events.______________________________ In pocket GENERAL THEORY OF MEANDERING VALLEYS SUBSURFACE EXPLORATION AND CHRONOLOGY OF UNDERFIT STREAMS

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“…The moraines of this region probably originated in both of these ways as some of them are known to date from the Pre-Allerød phase and others from the Post-Altered. Organic deposits at widely scattered sites in north-west Europe 1 have yielded by the technique of pollen analysis detailed information about the vegetation and climate of that temporary amelioration and the less favourable conditions which followed, and which also immediately preceded it. From such investigations a precise definition of this tripartite period has become possible and it is known as the Late-glacial Period.…”

Section: Introductionmentioning

confidence: 99%

Late-Glacial Cwm Glaciers In Wales

Seddon

1957

J. Glaciol.

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SUMMARY. The evidence for the existence of smaII glaciers in the cwms of the Caernarvonshire mountains during the Late-glacial Period is presented, and by an analysis of their dis tribution some of the factors responsible for their formation are deduced. These were primarily protection from insolation, drifting of snow into the cirques by wind and the distribution of precipitation.ZUSAMMENFASSUNG. Der Beweis von der Existenz kleiner Gletscher in den Karen des Caernarvonshire Gebirges in der Spiitglazialer Periode wird dargelegt, und durch eine Analyse ihrer Anordnung werden einige der Faktoren, die flir ihre Bildung verantwortlich sind, abgeleitet. Dies waren in erster Linie Schutz vor Besonnung, Schneetreiben in die Kare durch Wind und die Verbreitung von Niederschliigen.

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Das Alleröd-Interstadial als Leithorizont der letzten Vereisung in Europa und Amerika

Cited by 7 publications

References 2 publications

Late-glacial deposits at Llyn Dwythwch and Nant Ffrancon, Caernarvonshire

Late-glacial deposits at Llyn Dwythwch and Nant Ffrancon, Caernarvonshire

Subsurface exploration and chronology of underfit streams

Late-Glacial Cwm Glaciers In Wales

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