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Browsing by Author "Swain, F.M."

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    RI-41 Bottom Sediments and Organic Geochemical Residues of Some Minnesota Lakes
    (Minnesota Geological Survey, 1992) Swain, F.M.
    Holocene lake sediments of Minnesota are represented by six facies: I) northeastern-allogenic littoral sand and gravel, and profundal clay and copropel, in Precambrian crystalline rocks, with low to high total carbohydrates, high and variable amino acids, low to moderate hydrocarbons, and low to high pigments; II) northwestern-mixed allogenic clastics, and authigenic copropel and marl, in calcareous glacial drift and Pleistocene lake beds, with moderate carbohydrates, low amino acids, and stratigraphically variable pigments; III) north-central-authigenic marl, copropel, and allogenic sediments in thick calcareous glacial drift, with moderate carbohydrates, low amino acids, and stratigraphically variable pigments; N) east-central-authigenic copropel, marl, and allogenic clastics in calcareous and noncalcareous glacial drift, with high carbohydrates and amino acids, high hydrocarbons and polar lipids, high pigments, all stratigraphically variable; V) west-central and southwestern-allogenic silt, marl, and sapropel in calcareous glacial drift and gypsiferous Cretaceous shale, with high carbohydrates and amino acids, stratigraphically variable, high aromatic hydrocarbons; and VI) southeastern-allogenic fine clastics and copropel in Paleozoic clastic and carbonate rock and pre-Wisconsin drift, with known organic residues similar to those in Facies IV.
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    SP-03 Ostracoda of the Dubuque and Maquoketa Formations of Minnesota and Northern Iowa
    (Minnesota Geological Survey, 1965) Burr, J.H. Jr.; Swain, F.M.
    The ostracodes of the Dubuque Formation at Wubbles Ravine, Fillmore County, Minnesota and from the depauperate zone of the Maquoketa Formation at Bellevue State Park, Iowa comprise twelvecgenera and seventeen species, four of which are new. On the basis of the ostracode data assembled here it is concluded that: (1) the Dubuque Ostracoda differ slightly from those of other Middle and Upper Ordovician rocks in the Mississippi Valley; (2) no equivalent of the Eden and Maysville Groups can at present be recognized in ostracode assemblages from Minnesota; (3) an unconformity exists between the Dubuque and Maquoketa Formations, recognizable on both faunal and lithologic grounds; and (4) the ostracode species of the depauperate zone of the Maquoketa Formation are not as a whole characterized by reduced dimensions of the shell as are some of the macrofaunal species.