Alexander P. Wolfe
University of Alberta
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Publications 168
#1Ryan C. McKellar (KU: University of Kansas)H-Index: 13
#2Emma Jones (U of A: University of Alberta)H-Index: 1
Last. Philip J. Currie (U of A: University of Alberta)H-Index: 52
view all 9 authors...
Hadrosaurian dinosaurs were abundant in the Late Cretaceous of North America, but their habitats remain poorly understood. Cretaceous amber is also relatively abundant, yet it is seldom found in direct stratigraphic association with dinosaur remains. Here we describe an unusually large amber specimen attached to a Prosaurolophus jaw, which reveals details of the contemporaneous paleoforest and entomofauna. Fourier-transform Infrared spectroscopy and stable isotope composition (H and C) suggest t...
1 CitationsSource
#1Mark A. WilliamsH-Index: 69
#1Mark WilliamsH-Index: 71
Last. Colin SummerhayesH-Index: 25
view all 15 authors...
2 CitationsSource
#1Peter A. SiverH-Index: 23
#2Alexander P. WolfeH-Index: 48
Last. Anne Marie LottH-Index: 6
view all 7 authors...
#1Gabriela González Arismendi (U of A: University of Alberta)H-Index: 1
#2Ralf Tappert (U of A: University of Alberta)H-Index: 17
Last. Karlis Muehlenbachs (U of A: University of Alberta)H-Index: 50
view all 5 authors...
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...
1 CitationsSource
#1Kaarel Mänd (UT: University of Tartu)H-Index: 2
#2Karlis Muehlenbachs (U of A: University of Alberta)H-Index: 50
Last. Kurt O. Konhauser (U of A: University of Alberta)H-Index: 50
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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...
8 CitationsSource
#1Jan Zalasiewicz (University of Leicester)H-Index: 37
#2Colin N. Waters (BGS: British Geological Survey)H-Index: 26
Last. Mark Williams (University of Leicester)H-Index: 71
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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...
42 CitationsSource
#1Alexander P. Wolfe (U of A: University of Alberta)H-Index: 48
#2Alberto V. Reyes (U of A: University of Alberta)H-Index: 18
Last. John A. Westgate (U of T: University of Toronto)H-Index: 43
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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...
12 CitationsSource
#1Jan Zalasiewicz (University of Leicester)H-Index: 37
#2Mark Williams (University of Leicester)H-Index: 71
Last. Alexander P. Wolfe (U of A: University of Alberta)H-Index: 48
view all 25 authors...
We assess the scale and extent of the physical technosphere, defined here as the summed material output of the contemporary human enterprise. It includes active urban, agricultural and marine components, used to sustain energy and material flow for current human life, and a growing residue layer, currently only in small part recycled back into the active component. Preliminary estimates suggest a technosphere mass of approximately 30 trillion tonnes (Tt), which helps support a human biomass that...
32 CitationsSource
#1Jan ZalasiewiczH-Index: 37
#2Colin N. WatersH-Index: 26
Last. Mark A. WilliamsH-Index: 69
view all 27 authors...
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...
25 CitationsSource