Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Terminal cretaceous environmental events.

C B Officer, C L Drake

    Science (New York, N.Y.)
    |March 8, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The geologic record shows iridium was deposited over thousands of years, not instantaneously. Evidence suggests volcanic activity, not an asteroid impact, caused these terminal Cretaceous environmental events.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Meta-analysis of on-the-road experimental studies of hypnotics: effects of time after intake, dose, and half-life.

    Traffic injury prevention·2014
    Same author

    Beyond sleep duration: distinct sleep dimensions are associated with obesity in children and adolescents.

    International journal of obesity (2005)·2013
    Same author

    ICA methods for MEG imaging.

    Neurology & clinical neurophysiology : NCN·2005
    Same author

    Effects of rapid versus slow accumulation of eight hours of sleep loss.

    Psychophysiology·2002
    Same author

    Effects of an experimentally induced rhinovirus cold on sleep, performance, and daytime alertness.

    Physiology & behavior·2001
    Same author

    Scoring reliability of the multiple sleep latency test in a clinical population.

    Sleep·2000
    Same journal

    Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

    Science (New York, N.Y.)·2026
    Same journal

    Local signals, systemic decline.

    Science (New York, N.Y.)·2026
    Same journal

    The mechanics of liver regeneration.

    Science (New York, N.Y.)·2026
    Same journal

    Computing in a memory with physics.

    Science (New York, N.Y.)·2026
    Same journal

    Retraction.

    Science (New York, N.Y.)·2026
    Same journal

    Making time.

    Science (New York, N.Y.)·2026
    See all related articles

    Area of Science:

    • Geochemistry
    • Paleontology
    • Volcanology

    Background:

    • The terminal Cretaceous period is marked by significant environmental changes.
    • The origin of iridium and associated elements found in the geologic record has been debated.
    • Distinguishing between impact events and volcanic activity is crucial for understanding past extinctions.

    Purpose of the Study:

    • To analyze the depositional timeframe of iridium and associated elements.
    • To determine the origin of these elements (mantle vs. meteoritic).
    • To evaluate the likelihood of an asteroid impact versus volcanic events as the cause of terminal Cretaceous environmental changes.

    Main Methods:

    • Geologic record analysis
    • Elemental deposition analysis

    Related Experiment Videos

  • Chronological dating of geologic strata

    • Main Results:

    • Iridium and associated elements were deposited over a period of 10,000 to 100,000 years.
    • Geologic evidence supports a mantle origin for these elements.
    • The findings align with a scenario of intense volcanic activity, not a single asteroid impact.

    Conclusions:

    • The deposition of iridium and associated elements was not instantaneous.
    • Volcanic activity is favored as the source of these elements.
    • A series of volcanic events, rather than an asteroid impact, likely caused the terminal Cretaceous environmental changes.