JMDMT #1893 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - cataclasis [2], coincident with the crater; (5) sedimentary breccia thickening toward the crater and thickest within it; and (6) abundant ejecta of melt rock. The lowermost crater rock is fractured crystalline basement of Proterozoic age. Cataclastic breccia dikes are included. The overlying monomictic Tandsbyn Breccia (TB) consists of basement fragments. Its upper boundary against the Lockne Breccia (LB) is sharp. The LB has mostly sedimentary clasts from a 70-m-thick succession of marine Cambrian and Ordovician. Some limestone clasts are over 100 m3. The LB grades upward into arenitic Loftarstone [3], which is size sorted, fining upward, and mostly massive. Structures indicate turbidite-like deposition [2]. Lockne Breccia and Loftarstone



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JMDMT #353 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection -in various European waters.- ' Size variants have been reported from different Swiss lakes: 92 ju in Lake Como, to 707 n in Lake Schwendi.-'' SampHng several ponds in the vicinity of Darmstadt, Germany at 2-week intervals over a 5-year period, Ljg|-29a found that population density fluctuated with rise and fall of tempera- ture. He noted seasonal variation in both horn length and horn number in C. hirundella. In the summer four-horned type, for example, horns were shorter during very hot summers than they were during cooler ones. Ap- parently, in fresh, as well as marine waters, horn development is an adaptive modification to resist sinking below optimal food and sunUt levels. Flaring, sail-like, structures from the girdle, inverted umbrella and parachute type membranes as in Ornithoceras, Diuophysis, and other forms'* ■-''



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JMDMT #802 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - and larger linear polyring aromatics have not been identified in extracts of soils or marine sediments. Carruthers'' has isolated some alkylanthracenes from crude oils; but in petroleum also, phenanthrenes are much more abundant than anthracenes. Sedimental extracts can be divided into two broad classes: (1) soil or aerobic, and (2) marine sediment or anaerobic. Overlaps do exist. Anaerobes and aerobes both live in soils and marine sediments, but aerobes appear dominant in most soils. Soil extracts normally contain more wax-esters and less free sulfur and aromatic hydrocarbons than do extracts of marine sediments.' •'' Although the same molecular structures appear to be present''* in sedi- mental hydrocarbons,



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JMDMT #353 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection -in various European waters.- ' Size variants have been reported from different Swiss lakes: 92 ju in Lake Como, to 707 n in Lake Schwendi.-'' SampHng several ponds in the vicinity of Darmstadt, Germany at 2-week intervals over a 5-year period, Ljg|-29a found that population density fluctuated with rise and fall of tempera- ture. He noted seasonal variation in both horn length and horn number in C. hirundella. In the summer four-horned type, for example, horns were shorter during very hot summers than they were during cooler ones. Ap- parently, in fresh, as well as marine waters, horn development is an adaptive modification to resist sinking below optimal food and sunUt levels. Flaring, sail-like, structures from the girdle, inverted umbrella and parachute type membranes as in Ornithoceras, Diuophysis, and other forms'* ■-''



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