Matches in SemOpenAlex for { <https://semopenalex.org/work/W2783221521> ?p ?o ?g. }
Showing items 1 to 55 of
55
with 100 items per page.
- W2783221521 abstract "Permineralized plant remains occur individually and in small mats within anoxic and dysoxic marine black shales deposited seaward of the Wedington delta (Fayetteville Formation, Middle Chester) in northwestern Arkansas. Plant debris and associated cephalopods occur within 20 km of offshore bars that developed at the mouths of delta distributary channels. The bars were produced by longshore paleocurrents flowing eastward among the southwestern margin of the Ozark Dome. The flora includes several genera of arborescent lycopods, zygopteridalean ferns, filicalean ferns, calamites, medullosan seed ferns and seed fern remains with features that are characteristic of the Lyginopteridaceae. Among the lyginopteridalean stems are specimens that have been described as Megaloxylon wheelerae , an arborescent form, as well as several undescribed species. Two stems with prominent leaf scars represent one species of a new genus. The stems measure 35 cm and 34 cm long, and are approximately 2.5 cm in diameter. Leaf arrangement is helical, approaching a 3/8 phyllotaxis, with internodal lengths of about 3 cm. Stems are eustelic with a polygonal primary body 3-4 mm in diameter. Each leaf trace diverges from the cauline bundle as a single strand. The strand trifurcates in the cortex to produce a distinctive configuration of two c-shaped lateral bundles separated by a tangentially elongated central strand. Pith cells are large with prominent walls. Some show internal contents suggestive of secretory substances. The primary body is surrounded by a distinctive zone of wood 3-4 cm wide. Large rays 2-5 cells wide and more than 8 mm high separate wedges of tracheids that typically are 2-4 cells wide. Secondary tracheids display multiseriate oval bordered pits on the radial walls. Vascular cambium and secondary phloem are present, but incompletely preserved. The cortex is differentiated into an inner parenchymatous zone with horizontally elongated “sclerotic” nests, and an outer zone of alternating bands of vertically elongated sclerenchyma and parenchyma. This material significantly increases our knowledge of Namurian floras inhabiting non peat-forming environments, and emphasizes the systematic diversity among hydrasperman gymnosperms at the base of the Upper Carboniferous." @default.
- W2783221521 created "2018-01-26" @default.
- W2783221521 creator A5032855752 @default.
- W2783221521 creator A5041739643 @default.
- W2783221521 creator A5079352619 @default.
- W2783221521 date "1992-01-01" @default.
- W2783221521 modified "2023-09-24" @default.
- W2783221521 title "Lyginopterid seed ferns in basal Upper Carboniferous marine black shale deposits of midcontinent North America" @default.
- W2783221521 doi "https://doi.org/10.1017/s2475262200007553" @default.
- W2783221521 hasPublicationYear "1992" @default.
- W2783221521 type Work @default.
- W2783221521 sameAs 2783221521 @default.
- W2783221521 citedByCount "0" @default.
- W2783221521 crossrefType "journal-article" @default.
- W2783221521 hasAuthorship W2783221521A5032855752 @default.
- W2783221521 hasAuthorship W2783221521A5041739643 @default.
- W2783221521 hasAuthorship W2783221521A5079352619 @default.
- W2783221521 hasBestOaLocation W27832215211 @default.
- W2783221521 hasConcept C109007969 @default.
- W2783221521 hasConcept C127313418 @default.
- W2783221521 hasConcept C149918038 @default.
- W2783221521 hasConcept C151730666 @default.
- W2783221521 hasConcept C153127940 @default.
- W2783221521 hasConceptScore W2783221521C109007969 @default.
- W2783221521 hasConceptScore W2783221521C127313418 @default.
- W2783221521 hasConceptScore W2783221521C149918038 @default.
- W2783221521 hasConceptScore W2783221521C151730666 @default.
- W2783221521 hasConceptScore W2783221521C153127940 @default.
- W2783221521 hasLocation W27832215211 @default.
- W2783221521 hasOpenAccess W2783221521 @default.
- W2783221521 hasPrimaryLocation W27832215211 @default.
- W2783221521 hasRelatedWork W108379990 @default.
- W2783221521 hasRelatedWork W1982009605 @default.
- W2783221521 hasRelatedWork W2000835037 @default.
- W2783221521 hasRelatedWork W2029473812 @default.
- W2783221521 hasRelatedWork W2058617581 @default.
- W2783221521 hasRelatedWork W2066118993 @default.
- W2783221521 hasRelatedWork W2087319422 @default.
- W2783221521 hasRelatedWork W2185535308 @default.
- W2783221521 hasRelatedWork W2284566926 @default.
- W2783221521 hasRelatedWork W2327821493 @default.
- W2783221521 hasRelatedWork W2334172463 @default.
- W2783221521 hasRelatedWork W2342848403 @default.
- W2783221521 hasRelatedWork W2470899722 @default.
- W2783221521 hasRelatedWork W2510751364 @default.
- W2783221521 hasRelatedWork W2952612311 @default.
- W2783221521 hasRelatedWork W2964122477 @default.
- W2783221521 hasRelatedWork W3133602907 @default.
- W2783221521 hasRelatedWork W3140411050 @default.
- W2783221521 hasRelatedWork W3144961618 @default.
- W2783221521 hasRelatedWork W3166288733 @default.
- W2783221521 isParatext "false" @default.
- W2783221521 isRetracted "false" @default.
- W2783221521 magId "2783221521" @default.
- W2783221521 workType "article" @default.