Über ein Vorkommen von Kautschuk in mitteldeutschen Braunkohlenlagern

Kindscher, E.

doi:10.1002/cber.19240570718

Cited by 11 publications

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“…Closer examination of latex filaments in E. eocenica compressions was prompted by the superficial similarity of the latex meshwork to the larger, much coarser hair-like masses of fossil rubber strands found in Eocene brown coals of central Europe (Hartig, 1848;Kindscher, 1924;Beck-Mannagetta, 1964), referred to colloquially as ''Affenhaar'' (ape hair) (Kindscher, 1924;Jurasky, 1928Jurasky, , 1930. Closer examination of latex filaments in E. eocenica compressions was prompted by the superficial similarity of the latex meshwork to the larger, much coarser hair-like masses of fossil rubber strands found in Eocene brown coals of central Europe (Hartig, 1848;Kindscher, 1924;Beck-Mannagetta, 1964), referred to colloquially as ''Affenhaar'' (ape hair) (Kindscher, 1924;Jurasky, 1928Jurasky, , 1930.…”

Section: Holotype-usnmmentioning

confidence: 99%

The fossil record of Eucommia (Eucommiaceae) in North America

Call

Dilcher

1997

American J of Botany

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Reproductive and vegetative remains of Eucommia from 25 localities in the United States, Canada, and Mexico document the wide distribution of this genus in North America during the Cenozoic. Autofluorescent elastic latex filaments bearing capitate termini are preserved in nearly all of the remains and provide conclusive evidence of their affinity to Eucommia. Four species of Eucommia are recognized on the basis of the characteristic samaras: E. eocenica from middle Eocene strata of the Mississippi Embayment in Missouri, Tennessee and Mississippi; E. montana from early Eocene to early Oligocene localities in British Columbia, Washington, Oregon, Utah, Colorado, and Montana; E. constans from Neogene rocks in central Mexico; and E. jeffersonensis n. sp. from the latest Eocene or earliest Oligocene John Day Formation of Oregon. Atypical specimens of E. montana and E. eocenica are the first records of two-seeded fruits for the genus. Eucommia leaves from Eocene localities in British Columbia and Mississippi are the first records of Eucommia foliage in North America whose identifications are confirmed by the presence of capitate latex strands. These leaves and a specimen from Oregon are referred to E. rolandii n. sp. Fruit evolution in Eucommia may have involved increases in samara size and symmetry, and reduction in seed number from two to one, perhaps as adaptations for wind dispersal. All fossil Eucommia samaras from North America are smaller and less symmetrical than those of the living species, E. ulmoides. Preliminary flight tests of E. ulmoides samaras and of models of the fossils suggest that E. ulmoides fruits are aerodynamically better suited for wind dispersal than the fossils.

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Section: Holotype-usnmmentioning

confidence: 99%

The fossil record of Eucommia (Eucommiaceae) in North America

Call

Dilcher

1997

American J of Botany

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Untersuchungen über Isatin und verwandte Verbindungen, VII: Zur Kenntnis der Isonitroso‐acetanilide

Borsche

Fritzsche

1926

Ber. dtsch. Chem. Ges. A/B

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Ansisuern die Dibenzal-thioglykolsaure in einer Ausbeute von 62 yo lieferte.( W a l t e r Meyer.) Bei diesen beiden Kondensationen treten im Gegensatz zu den Diphenylfulgensaure-Synthesen sehr wenig Harze auf, Der Thiodiglykolsaure-ester reagiert also mit dem Benzaldehyd, sowohl in atherischer als ganz besonders in alkoholischer Lijsung viel glatter als der Bernsteinsaure-ester. Die Wasserstoffatome seiner beiden Methylene werden eben durch je ein Carboxathyl und durch das Schwefelatom sehr gelockert. Das Schwefelatom ist hiernach also dem Athylenradikal des ebenfalls leicht kondensierbaren Phenyl-itaconsaure-esters in seiner Wirkung auf das benachbarte Methylen gleichzustellen. D i b en z a1t hi o dig I y k o 1 s a u r ean h y d r i d (11) entsteht bei 6 -8-stdg. Kochen der Dibenzal-thiodiglykolsaure mit der 3-fachen Menge Acetylchlorid. Krystallisiert beim Binengen der Reaktionsflussigkeit in citronengelben, glanzenden Nadeln aus. Schmp. IIOO (aus Schwefelkohlenstoff oder Benzin). 0.1947, 0.1682 g Sbst.: 0.5012, 0.4318 g CO,, 0.0699, 0.0629 g H,O. -0.1861, 0.2459 g Sbst.: 0.1449. 0.1938 g BaSO,. -0.6751, 0.9163 g Sbst. emidrigen in 21.97 g Benzol den Gefrierpunkt um 0.483~. 0.649~.

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Terpenoids—Especially Oxygenated Mono-, Sesqui-, Di-, and Triterpenes

Streibl

Herout

1969

Organic Geochemistry

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Über ein Vorkommen von Kautschuk in mitteldeutschen Braunkohlenlagern

Cited by 11 publications

References 0 publications

The fossil record of Eucommia (Eucommiaceae) in North America

The fossil record of Eucommia (Eucommiaceae) in North America

Untersuchungen über Isatin und verwandte Verbindungen, VII: Zur Kenntnis der Isonitroso‐acetanilide

Terpenoids—Especially Oxygenated Mono-, Sesqui-, Di-, and Triterpenes

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