GERTA KELLER BOOKS

SPE505: Volcanism, Impacts, and Mass Extinctions: Causes and Effects

TitleSPE505: Volcanism, Impacts, and Mass Extinctions: Causes and Effects
Publication TypeBook
Year of Publication2014
AuthorsKeller, G, Kerr, AC
Series TitleGSA Special Papers
Volume505
PublisherGeological Society of America
CityBoulder
ISBN978-0-8137-2505-5
Abstract

The 26 chapters of this symposium volume encompass reviews of special topics, summaries of particular datasets and original research contributions. Together they span age intervals ranging from the Neoproterozoic, Mesozoic to Paleogene and Recent addressing a variety of stratigraphic, paleoecologic, environmental and paleoclimatic events. These contributions are organized under four themes: 1. Applications, 2. Paleoecology—Recent, 3. Global bioevents—PE and KTB, and 4. Biodiversity and Stratigraphy in Deep Time. 

URLhttp://specialpapers.gsapubs.org/content/current
DOI10.1130/9780813725055

Proceedings of XXIII Indian Colloquium on Micropaloentology and Stratigraphy and International Symposium on Global Bioevents

TitleProceedings of XXIII Indian Colloquium on Micropaloentology and Stratigraphy and International Symposium on Global Bioevents
Publication TypeBook
Year of Publication2013
AuthorsMalarkodi, N, Keller, G, Reddy, AN, Jaiprakask, BC
Volume1
EditionSpecial Publication
Number of Pagesxii + 338
PublisherGeological Society of India
CityBangalore
ISBN978-93-80998-08-4
Abstract

The 26 chapters of this symposium volume encompass reviews of special topics, summaries of particular datasets and original research contributions. Together they span age intervals ranging from the Neoproterozoic, Mesozoic to Paleogene and Recent addressing a variety of stratigraphic, paleoecologic, environmental and paleoclimatic events. These contributions are organized under four themes: 1. Applications, 2. Paleoecology - Recent, 3. Global bioevents - PE and KTB, and 4. Biodiversity and Stratigraphy in Deep Time. 

URLhttp://www.geosocindia.com/index.php?page=shop.product_details&flypage=flypage-ask.tpl&product_id=227&category_id=20&option=com_virtuemart&Itemid=6

The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas

TitleThe End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas
Publication TypeBook
Year of Publication2011
Series EditorKeller, G, Adatte, T
Series VolumeSEPM Special Publication Volume 100
PublisherSEPM Society for Sedimentary Geology
ISBN Number9781565763098
ISBN9781565763081
Abstract

One of the liveliest, contentious, and long-running scientific debates began over three decades ago with the discovery of an iridium anomaly in a thin clay layer at Gubbio, Italy, that led to the hypothesis that a large impact caused the end-Cretaceous mass extinction. For many scientists the discovery of an impact crater near Chicxulub on Yucatan in 1991 all but sealed the impact-kill hypothesis as proven with the impact as sole cause for the mass extinction. Ever since that time evidence to the contrary has generally been interpreted as an impact-tsunami disbturbance. A multi-disciplinary team of reserachers has tested this assertion in new cores and a dozen outcrops along the Brazos River, Texas. In this area undisturbed sediments reveal a complete time stratigraphic sequence containing the primary impact spherule ejecta layer in late Maastrichtian claystones deposited about 200-300 thousand years before the mass extinction.  PDF

URLhttp://ebooks.geoscienceworld.org/content/the-end-cretaceous-mass-extinction-and-the-chicxulub-impact-in-texas.tab-info
DOI10.2110/sepmsp.100

Cretaceous-Tertiary (K/T) mass extinction: effect of global change on calcareous microplankton

TitleCretaceous-Tertiary (K/T) mass extinction: effect of global change on calcareous microplankton
Publication TypeBook Chapter
Year of Publication1995
AuthorsKeller, G, Perch-Nielsen, K
Book TitleEffects of Past Global Change on Life, S. Stanley and J.P. Kennett (eds.)
Pagination72-93
PublisherNational Academy of Science
Abstract

The effects of the Cretaceous-Tertiary (K/T) boundary global change on calcareous nannoplankton and planktic foraminifera are most severe in low latitudes and negligible in high latitudes. In low latitudes, species extinctions are complex and prolonged beginning during the final 100,000 to 300,000 yr of the Cretaceous, accelerating across the K/T boundary, and reaching maximum negative conditions between 10,000 and 40,000 yr into the Tertiary accompanied by low primary productivity. In high latitudes, no significant species extinctions occurred at or near the K/T boundary, and all dominant species thrived well into the early Tertiary. Return to a more stable ecosystem and to increased marine productivity in low latitudes does not occur until about 250,000 to 350,000 yr after the K/T boundary, coincident with the extinction of Cretaceous survivors in high latitudes. Within this transition interval, habitats of deep- and intermediate-dwelling tropical planktic foraminiferal species are gradually and selectively eliminated in low latitudes, and by K/T boundary time only cosmopolitan surface dwellers survive. This implies the disruption of the water-mass structure, change in the thermocline, and a drop in surface productivity. Although no single cause is likely to account for these different prolonged and dramatic faunal and environmental changes between low and high latitudes, long-term oceanic instability associated with sea-level, temperature, salinity, and productivity fluctuations may account for most of the faunal changes observed in planktic foraminifera. However, other environmental changes (e.g., volcanism, bolide impact) may have accelerated the demise of the low latitude Cretaceous fauna already on the decline.

URLhttps://www.nap.edu/read/4762/chapter/6

Field guide to Cretaceous-tertiary boundary sections in northeastern Mexico

TitleField guide to Cretaceous-tertiary boundary sections in northeastern Mexico
Publication TypeBook
Year of Publication1994
AuthorsKeller, G, Stinnesbeck, W, Adatte, T, MacLeod, N, Lowe, DR
Series TitleLPI Contribution No 827
PublisherLunar and Planetary Institute
CityHouston
Abstract

This guide was prepared for the field trip to the KT elastic sequence of northeastern Mexico, 5-8 February 1994, in conjunction with the Conference on New Developments Regarding the KT Event and Other Catastrophes in Earth History, held in Houston, Texas. The four-day excursion offers an invaluable opportunity to visit three key outcrops: Arroyo El Mimbral, La Lajilla, and El Pinon. These and other outcrops of this sequence have recently been interpreted as tsunami deposits produced by the meteorite impact event that produced the 200 to 300-km Chicxulub basin in Yucatan, and distributed ejecta around the world approximately 65 m.y. ago that today is recorded as a thin clay layer found at the K/T boundary. The impact tsunami interpretation for these rocks has not gone unchallenged, and others examining the outcrops arrive at quite different conclusions: not tsunami deposits but turbidites; not KT at all but 'upper Cretaceous.' Indeed, it is in hopes of resolving this debate through field discussion, outcrop evaluation, and sampling that led the organizers of the conference to sanction this field trip. This field guide provides participants with background information on the KT clastic sequence outcrops and is divided into two sections. The first section provides regional and logistical context for the outcrops and a description of the clastic sequence. The second section presents three representative interpretations of the outcrops by their advocates. There is clearly no way that these models can be reconciled and so two, if not all three, must be fundamentally wrong. Readers of this guide should keep in mind that many basic outcrop observations that these models are based upon remain unresolved. While great measures were taken to ensure that the information in the description section was as objective as possible, many observations are rooted in interpretations and the emphasis placed on certain observations depends to some degree upon the perspective of the author.

URLhttp://www.researchgate.net/publication/24303161_Field_guide_to_Cretaceous-tertiary_boundary_sections_in_northeastern_Mexico