Browsing by Author "Johnson, Kirk R."

Bighorn Basin Coring Project (BBCP): a continental perspective on early Paleogene hyperthermals

Clyde, W. C.; Gingerich, P. D.; Wing, Scott L.; Röhl, U.; Westerhold, T.; Bowen, G.; Johnson, Kirk R.; Baczynski, A. A.; Diefendorf, A.; McInerney, F.; Schnurrenberger, D.; Noren, A.; Brady, K. (2013)

Cobbania corrugata gen. et comb. nov. (Araceae): a floating aquatic monocot from the Upper Cretaceous of western North America

Stockey, R. A.; Rothwell, G. W.; Johnson, Kirk R. (2007)

Comparison of Leaf Samples from Mapped Tropical and Temperate Forests: Implications for Interpretations of the Diversity of Fossil Assemblages

Ellis, Beth; Johnson, Kirk R. (2013)

We characterize forest floor leaf litter and transported leaf samples from several depositional environments in both a temperate and a tropical forest to provide well-characterized modern analogs for the evaluation of ...

A complete Os excursion across a terrestrial Cretaceous-Paleogene boundary at the West Bijou Site, Colorado, with evidence for recent open system behavior

Zaiss, Jessica; Ravizza, Greg; Goderis, Steven; Sauvage, Justine; Claeys, Philippe; Johnson, Kirk R. (2014)

The few previously reported values of Os-187/Os-188 ratios from non-marine K-Pg boundary sections are distinctly higher than the range of Os-187/Os-188 ratios measured in chondrites and the range of ratios predicted by ...

Constructing a time scale of biotic recovery across the Cretaceous–Paleogene boundary, Corral Bluffs, Denver Basin, Colorado, U.S.A

Fuentes, Anthony J.; Clyde, William C.; Weissenburger, Ken; Bercovici, Antoine; Lyson, Tyler R.; Miller, Ian M.; Ramezani, Jahandar; Isakson, Vincent; Schmitz, Mark D.; Johnson, Kirk R. (2019)

Wilf, Peter; Johnson, Kirk R.; Huber, Brian T. (2003)

Cruisin' the fossil coastline: the travels of an artist and a scientist along the shores of the prehistoric Pacific

Johnson, Kirk R.; Troll, Ray (2018)

In this long-awaited sequel Kirk Johnson and Ray Troll are back on a road trip - driving, flying, and boating their way from Baja, California to northern Alaska in search of the fossil secrets of North America's Pacific ...

Decoupled plant and insect diversity after the end-Cretaceous extinction

Wilf, Peter; Labandeira, Conrad C.; Johnson, Kirk R.; Ellis, B. (2006)

Denver's Natural History Museum: A History

Johnson, Kirk R.; Armstrong, B.; Colwell-Chanthaphonh, C.; Kruger, F.; Haglund, K. A.; Krell, F. -T (2013)

Devastation of Terrestrial Ecosystems at the K-T Boundary in North America: The First Calibrated Record of Plant and Animal Response to the Chixulub Impact

Johnson, Kirk R.; Nichols, Donald K.; Labandeira, Conrad C.; Pearson, Dean (Lunar and Planetary Institute, 2000)

Dinosaur skeleton occurrence in the latest Cretaceous (late Maastrichtian) Hell Creek formatin of Southwestern North Dakota and Souteastern Montana

Lyson, Tyler R.; Rossetto, Gabriella; Evans, Erica S. J.; Bercovici, Antoine; Johnson, Kirk R.; Pearson, Dean (2016)

The Cretaceous/Paleogene (K/Pg) mass extinction event is one of the best-studied mass extinction events. However there is still debate regarding the mechanism and tempo of the extinction for terrestrial vertebrates, ...

Direct high-precision U Pb geochronology of the end-Cretaceous extinction and calibration of Paleocene astronomical timescales

Clyde, William C.; Ramezani, Jahandar; Johnson, Kirk R.; Bowring, Samuel A.; Jones, Matthew M. (2016)

The Cretaceous Paleogene (K Pg) boundary is the best known and most widely recognized global time horizon in Earth history and coincides with one of the two largest known mass extinctions. We present a series of new ...

Evaluating Relationships among Floating Aquatic Monocots: a New Species of Cobbania (Araceae) from the Upper Maastrichtian of South Dakota

Stockey, Ruth A.; Rothwell, Gar W.; Johnson, Kirk R. (2016)

Premise of research. A large number of floating aquatic aroid fossils have been recovered from pond sediments in the Hell Creek Formation (Upper Cretaceous) of South Dakota, providing valuable new data about aquatic ...

Extinctions at the antipodes

Johnson, Kirk R. (1993)

First cycad seedling foliage from the fossil record and inferences for the Cenozoic evolution of cycads

Erdei, Boglárka; Coiro, Mario; Miller, Ian; Johnson, Kirk R.; Griffith, M. Patrick; Murphy, Vickie (2019)

First record of Todea (Osmundaceae) in South America, from the early Eocene paleorainforests of Laguna del Hunco (Patagonia, Argentina)

Carvalho, Mónica R.; Wilf, Peter; Hermsen, Elizabeth J.; Gandolfo, Maria A.; Cúneo, N. Rubén; Johnson, Kirk R. (2013)

o Premise of the Study: The early Eocene Laguna del Hunco caldera-lake paleoflora (ca. 52 Ma) from Chubut Province, Argentina, is notably diverse and includes many conifer and angiosperm lineages that are extinct in South ...

First South American <I>Agathis</I> (Araucariaceae), Eocene of Patagonia

Wilf, Peter; Escapa, Ignacio H.; Cúneo, N. Rubén; Kooyman, Robert M.; Johnson, Kirk R.; Iglesias, Ari (2014)

Premise of the study: Agathis is an iconic genus of large, ecologically important, and economically valuable conifers that range over lowland to upper montane rainforests from New Zealand to Sumatra. Exploitation of its ...

Fossil leaf economics quantified: calibration, Eocene case study, and implications

Royer, Dana L.; Sack, Lawren; Wilf, Peter; Lusk, Christopher H.; Jordan, Gregory J.; Niinemets, Ulo; Wright, Ian J.; Westoby, Mark; Cariglino, Barbara; Coley, Phyllis D.; Cutter, Asher D.; Johnson, Kirk R.; Labandeira, Conrad C.; Moles, Angela T.; Palmer, Matthew B.; Valladares, Fernando (2007)

A global approach for natural history museum collections

Johnson, Kirk R.; Owens, Ian F. P.; Global Collection Group (2023)

Guide to Insect (and Other) Damage Types on Compressed Plant Fossils (version 3.0)

Labandeira, Conrad C.; Wilf, Peter; Johnson, Kirk R.; Marsh, F.; (2007)

Browsing by Author "Johnson, Kirk R."

Browsing by Author "Johnson, Kirk R."

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