000097748 001 __ 97748
000097748 005 __20141013123346.0
000097748 024 8_ $9 driver $9 artpubuab $a oai:ddd.uab.cat:97748
000097748 024 7_ $2 doi $a 10.1344/105.000001711
000097748 035 __ $9 articleid $a 16965728v10n2p189
000097748 041 __ $a eng
000097748 100 __ $a Villalba Breva, Sheila $u Universitat de Barcelona. Departament d’Estratigrafia, Paleontologia i Geociències Marines
000097748 245 1_ $a Peat-forming plants in the Maastrichtian coals of the Eastern Pyrenees
000097748 520 3_ $a The Lower Maastrichtian of Fumanya and neighbouring localities of the Vallcebre syncline (Eastern Pyrenees, Catalonia) provide the first taphonomic evidence for the hypothesis that cheirolepidiacean conifers were significant precursors of Maastrichtian Pyrenean coal. Most Frenelopsis-rich lignite beds do not bear rootlet marks, suggesting that the original peat was detrital. Sedimentological and taphonomic evidence indicates deposition in the margins of a lagoon after the transport of the cheirolepidiacean remains by flotation. The same parautochtonous assemblage includes complete impressions Sabalites longirhachis leaves and large impressions of logs attributed to the same palm trees. Other parautochthonous or allochthonous plant megaremains include extremely rare cycadalean and monocot leaves and abundant minute angiosperm seeds. Rootlet marks associated with thin lignite beds occur at the top of some charophyte limestones. The charophyte association, dominated by in situ accumulation of Peckichara and Microchara gyrogonites, suggests that these limestones were deposited in shallow, freshwater lakes and that the corresponding peat mires were limnic rather than paralic in nature. The botanical affinity of plant remains associated with these root-bearing lignites is uncertain. Palynological analysis showed abundant bisaccates, with less abundant fern spores and freshwater algal oospores. Locally, the abundant rootlet marks were associated with large brush-like rooting structures attributed to Sabalites longirhachis palms. Our results show that, at the beginning of the Maasrichtian, cheirolepidiacean conifers were still significant peat-producing plants, although, unlike analogous Lower Cretaceous ones, they shared this role with rare angiosperms, such as palms.
000097748 540 __ $a Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet l'ús comercial de l'obra i de les possibles obres derivades, la distribució de les quals s'ha de fer amb una llicència igual a la que regula l'obra original. $u http://creativecommons.org/licenses/by-sa/3.0/es/
000097748 546 __ $a Anglès
000097748 599 __ $a recerca
000097748 653 1_ $a Palaeobotany
000097748 653 1_ $a Calcareous algae
000097748 653 1_ $a Peat swamps
000097748 653 1_ $a Upper Cretaceous
000097748 653 1_ $a Pyrenees
000097748 655 _4 $a info:eu-repo/semantics/article
000097748 655 _4 $a info:eu-repo/semantics/publishedVersion
000097748 700 __ $a Martín-Closas, Carles $u Universitat de Barcelona. Departament d’Estratigrafia, Paleontologia i Geociències Marines
000097748 700 __ $a Marmi, J. $u Institut Català de Paleontologia
000097748 700 __ $a Gómez, B. $u Université Lyon 1
000097748 700 __ $a Fernández Marrón, Ma. Teresa $u Instituto de Geociencias (CSIC-UCM). UEI de Paleontología
000097748 773 __ $g Vol. 10, Núm. 2 (June 2012), p. 189-207 $t Geologica acta $x 1696-5728
000097748 856 40 $p 19 $s 3266992 $u http://ddd.uab.cat/pub/geoact/geoact_a2012m6v10n2/geoact_a2012m6v10n2p189.pdf
000097748 973 __ $f 0189 $l 207 $m June $n 2 $v 10 $x geoact_a2012m6v10n2 $y 2012
000097748 980 __ $a ARTPUB $b UAB $b GEOACT