Alexander P. Wolfe
University of Alberta
182Publications
45H-index
7,594Citations
Publications 182
Newest
Published on Oct 1, 2018in Geochimica et Cosmochimica Acta 4.69
Gabriela González Arismendi (University of Alberta), Ralf Tappert14
Estimated H-index: 14
(University of Alberta)
+ 2 AuthorsKarlis Muehlenbachs48
Estimated H-index: 48
(University of Alberta)
Abstract Deuterium exchange experiments on modern and fossil plant resins (amber) were conducted to assess to what extent diagenetic alteration can overprint the stable hydrogen ( δ 2 H) and carbon ( δ 13 C) isotopic composition of these materials. Pairs of resins and amber fragments were placed together with deuterated water in sealed quartz-glass tubes to assure that all samples were exposed equally to the chosen experimental conditions. Experiments lasting up to one year were carried out at t...
Source Cite
Kaarel Mänd2
Estimated H-index: 2
(University of Tartu),
Karlis Muehlenbachs48
Estimated H-index: 48
(University of Alberta)
+ 2 AuthorsKurt O. Konhauser47
Estimated H-index: 47
(University of Alberta)
Abstract Ambers—fossilized plant resins—are a rich and unique source of paleoecological data due to their ability to preserve soft body fossils. However, interpretations concerning their environmental context are often hampered by uncertainties in the relationship between assemblages of inclusions and geological context, particularly in the case of secondarily redeposited ambers such as those from the Paleogene of Central Europe. Here we use stable carbon and hydrogen isotope analyses, as well a...
5 Citations Source Cite
Published on Mar 1, 2017in Current Biology 9.25
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Ryan C. McKellar5
Estimated H-index: 5
(University of Regina)
+ 11 AuthorsAlexander P. Wolfe45
Estimated H-index: 45
(University of Alberta)
Summary In his correspondence, Markus Lambertz [1] raises some concerns about the phylogenetic placement and feather development of DIP-V-15103, the amber-entombed tail section that we recently reported [2] as fragmentary remains of a non-pygostylian coelurosaur (likely within the basal part of Coelurosauria). We here would like to respond to these concerns.
Source Cite
Published on Sep 1, 2017in Anthropocene
Jan Zalasiewicz33
Estimated H-index: 33
,
Colin N. Waters20
Estimated H-index: 20
+ 22 AuthorsAgnieszka Gałuszka19
Estimated H-index: 19
Abstract Since 2009, the Working Group on the ‘Anthropocene’ (or, commonly, AWG for Anthropocene Working Group), has been critically analysing the case for formalization of this proposed but still informal geological time unit. The study to date has mainly involved establishing the overall nature of the Anthropocene as a potential chronostratigraphic/geochronologic unit, and exploring the stratigraphic proxies, including several that are novel in geology, that might be applied to its characteriz...
26 Citations Source Cite
Published on Apr 1, 2017in Newsletters on Stratigraphy 3.63
Jan Zalasiewicz33
Estimated H-index: 33
,
Colin N. Waters20
Estimated H-index: 20
+ 24 AuthorsJacques Grinevald7
Estimated H-index: 7
A range of published arguments against formalizing the Anthropocene as a geological time unit have variously suggested that it is a misleading term of non-stratigraphic origin and usage, is based on insignificant temporal and material stratigraphic content unlike that used to define older geological time units, is focused on observation of human history or speculation about the future rather than geologically significant events, and is driven more by politics than science. In response, we conten...
20 Citations Source Cite
Published on Jul 1, 2017in Geology 5.07
Alexander P. Wolfe45
Estimated H-index: 45
(University of Alberta),
Alberto V. Reyes18
Estimated H-index: 18
(University of Alberta)
+ 5 AuthorsJohn A. Westgate42
Estimated H-index: 42
(University of Toronto)
Eocene paleoclimate reconstructions are rarely accompanied by parallel estimates of CO 2 from the same locality, complicating assessment of the equilibrium climate response to elevated CO 2 . We reconstruct temperature, precipitation, and CO 2 from latest middle Eocene (ca. 38 Ma) terrestrial sediments in the posteruptive sediment fill of the Giraffe kimberlite in subarctic Canada. Mutual climatic range and oxygen isotope analyses of botanical fossils reveal a humid-temperate forest ecosystem wi...
8 Citations Source Cite
Published on Dec 1, 2016in Current Biology 9.25
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Ryan C. McKellar5
Estimated H-index: 5
(University of Regina)
+ 11 AuthorsAlexander P. Wolfe45
Estimated H-index: 45
(University of Alberta)
Summary In the two decades since the discovery of feathered dinosaurs [1–3], the range of plumage known from non-avialan theropods has expanded significantly, confirming several features predicted by developmentally informed models of feather evolution [4–10]. However, three-dimensional feather morphology and evolutionary patterns remain difficult to interpret, due to compression in sedimentary rocks [9, 11]. Recent discoveries in Cretaceous amber from Canada, France, Japan, Lebanon, Myanmar, an...
30 Citations Source Cite
Published on Aug 1, 2016in Earth’s Future 4.59
Will Steffen44
Estimated H-index: 44
(Australian National University),
Reinhold Leinfelder21
Estimated H-index: 21
(Free University of Berlin)
+ 25 AuthorsMatt Edgeworth10
Estimated H-index: 10
(University of Leicester)
1 Citations Source Cite
Published on Mar 1, 2016in Cretaceous Research 1.93
Aaron J. van der Reest2
Estimated H-index: 2
(University of Alberta),
Alexander P. Wolfe45
Estimated H-index: 45
(University of Alberta),
Philip J. Currie45
Estimated H-index: 45
(University of Alberta)
Abstract A recently discovered articulated partial skeleton of Ornithomimus from the Upper Cretaceous Dinosaur Park Formation of Alberta, Canada is remarkable in the extent and quality of preservation of integumentary structures including feathers. It is the first ornithomimid to preserve a tail bearing extensive plumaceous feathers that are slightly more elongate in comparison to those present on the remainder of the body. However, the underside of the tail and the hind limb distal to the middl...
9 Citations Source Cite
12345678910