Results 11 to 20 of about 80,006 (331)
Advances in Mathematics, 2004 For an arbitrary finite Coxeter group W we define the family of Cambrian lattices for W as quotients of the weak order on W with respect to certain lattice congruences.
Billera +24 more
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On the Topology of the Cambrian Semilattices [PDF]
The Electronic Journal of Combinatorics, 2012 For an arbitrary Coxeter group $W$, David Speyer and Nathan Reading defined Cambrian semilattices $C_{\gamma}$ as semilattice quotients of the weak order on $W$ induced by certain semilattice homomorphisms.
Kallipoliti, Myrto, Mühle, Henri
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On the wildness of cambrian lattices [PDF]
Algebras and Representation Theory, 2017 In this note, we investigate the representation type of the cambrian lattices and some other related lattices. The result is expressed as a very simple trichotomy.
Chapoton, Frédéric, Rognerud, Baptiste
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The problem of the pre-Cambrian [PDF]
Geological Society of America Bulletin, 1908 Introduction Following the precedent of many scientific presidential addresses, I shall give a general review of one of the subjects which has occupied much of my time—the problem of the pre-Cambrian. Within an hour I can not consider the merits of the questions still in controversy, nor broadly cover the field mentioned; therefore I shall confine my ...
C. R. Van Hise
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Open Geosciences, 2021 The black rock series in the Qiongzhusi Formation contains important geochemical information about the early Cambrian tectonic and ecological environment of the southwestern Yangtze Block.
Liu Hao +8 more
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A possible case of inverted lifestyle in a new bivalved arthropod from the Burgess Shale [PDF]
Royal Society Open Science, 2019 The origin of the arthropod carapace, an enlargement of cephalic tergites, can be traced back to the Cambrian period. However, its disparity and evolution are still not fully understood.
Alejandro Izquierdo-López +1 more
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Shiyou shiyan dizhi, 2022 The Cambrian Xixiangchi Formation is an important succeeding stratum for gas exploration[JP] in the Lower Paleozoic of the Sichuan Basin, for which, the exploration degree is low, and the main controlling factors of large-scale[JP] reservoirs have not ...
Shuyuan SHI +14 more
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Morphology and relationships of the enigmatic stenothecoid pan-brachiopod Stenothecoides—new data from the middle Cambrian Burgess Shale Formation [PDF]
Acta Palaeontologica Polonica, 2021 Bulk sampling of middle Cambrian carbonate units in the lower Burgess Shale Formation (Wuliuan) and the upper Wheeler Formation (Drumian) in Utah have yielded abundant silicified stenothecoids.
PAUL A. JOHNSTON, MICHAEL STRENG
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Геодинамика и тектонофизика, 2021 We have studied terrigenous-carbonate rocks in the area near the Sayan mountains in the Irkutsk Region (Russia), specifically at the Shaman Cliff, being the stratotype area of rocks that belong to the Moty group.
Z. L. Motova +2 more
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New data on the anatomy of fuxianhuiid arthropod Guangweicaris spinatus from the lower Cambrian Guanshan Biota, Yunnan, China [PDF]
Acta Palaeontologica Polonica, 2020 The fuxianhuiid arthropod Guangweicaris spinatus, from the lower Cambrian (Series 2, Stage 4), Guanshan Biota (Wulongqing Member, Canglangpu Formation), located in the vicinity of Kunming (Yunnan Province, southwest China), is redescribed based on new ...
Hong Chen +4 more
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