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#Geochronology

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Planetary Ecologist

Chronozone (Geology terminology ⛰️)

A chronozone or chron is a unit in chronostratigraphy, defined by events such as geomagnetic reversals, or based on the presence of specific fossils. According to the International Commission on Stratigraphy, the term "chronozone" refers to the rocks formed during a particular time period, while "chron" refers to that time period. ...

en.wikipedia.org/wiki/Chronozo

en.wikipedia.orgChronozone - Wikipedia
#Chronozone#UnitsOfTime#Paleobiology
Public
Planetary Ecologist

Deep time (Evolution 🧬)

Deep time is a term introduced and applied by John McPhee to the concept of geologic time in his book Basin and Range, parts of which originally appeared in The New Yorker magazine. The philosophical concept of geological time was developed in the 18th century by Scottish geologist James Hutton; his "system of the habitable Earth" was a deistic mechan...

en.wikipedia.org/wiki/Deep_time

en.wikipedia.orgDeep time - Wikipedia
#DeepTime#Time#Evolution
Public
Bill Minarik

from the Rocky Mountain Association of Geologists:
Titanite: the Wedge-shaped Timepiece, by Ronald L. Parker

#Titanite has a distinctive crystal form that it flaunts…

…titanite is among the very few minerals that enjoy a larger color dispersion than that of diamond…

Hayden, Watson & Wark established that the relative concentration of Zr 4+ in titanite is systematically related to pressure and temperature conditions.

rmag.org/index.php?src=directo

www.rmag.orgTitanite: The Wedge-Shaped Timepiece | Rocky Mountain Association of GeologistsThe Rocky Mountain Association of Geologists is a nonprofit organization whose purposes are to promote interest in geology and allied sciences and their practical application, to foster scientific research and to encourage fellowship and cooperation among its members.
#MinCup24#Geochronology#Geothermobarometry
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Andy Baker

Dating Speleothems and Speleothem Growth

On Sunday I was invited to give a Science Forum webinar to the Australasian Cave and Karst Management Association. The topic was 'Dating Speleothems and Speleothem Growth'. The recording is now up on the ACKMA website. Although the talk was aimed as cave managers and guides, I hope it will be useful for anyone interested in caves and how they can be dated, as well as educators in the field of landscape evolution, Quaternary Science, stalagmite paleoclimate and caves and karst geomorphology.

andy-baker.org/2024/07/31/dati

Andy Baker · Dating Speleothems and Speleothem GrowthOn Sunday I was invited to give a Science Forum webinar to the Australasian Cave and Karst Management Association. The topic was ‘Dating Speleothems and Speleothem Growth’. The recordin…
#caves#karst#stalagmites
Public
michael

4-APR-2024
Ancient ocean oxygenation timeline revealed

eurekalert.org/news-releases/1

EurekAlert!Ancient ocean oxygenation timeline revealed<p><em>New study introduces a pioneering application of dolomite U-Pb geochronology, shedding new light on the evolution of ancient marine environments. By uncovering discrepancies in dolomite samples U-Pb ratios, the team developed a reliable proxy for reconstructing the levels of oxygen within ancient marine habitats, in which the first animals emerged and evolved. Their findings reveal a significant rise in marine oxygenation during the Late Paleozoic era (400 million years ago), hundreds of millions of years after the emergence of animal-life. These findings suggest that early-animals have evolved in oceans that were mostly oxygen-poor, and deepen our understanding of interactions between ecosystems and the evolution of complex life-forms. Understanding these relationships provides critical context for future observations of exoplanet’s atmospheres using the new generation of space-telescopes in search for extra-terrestrial life.</em></p>
#science#geochronology#astrobiology
Public
Dr Micha Campbell

I've been down a UTh rabbithole the last couple of weeks - did you know most labs still use #IsoPlot to correct their UTh dates? And IsoPlot only runs on ancient versions of excel... enter Pieter Vermeesch from UCL, who has kindly written an IsoplotR package!

There are limited examples out there (understandable as the packages does EVERYTHING), so I've put one up on my github - recorrecting published dates from Treble et al. (2022).

github.com/MichelineCampbell/s

GitHubsandbox/CalculateUThCorrections at master · MichelineCampbell/sandboxFun and random bits of useful code. Contribute to MichelineCampbell/sandbox development by creating an account on GitHub.
#geochronology#rStats
Public
Thomas Holtz

#NewPaper #Geochronology

Joeckel RM, Suarez CA, McLean NM, Möller A, Ludvigson GA, Suarez MB, Kirkland JI, Andrew J, Kiessling S, Hatzell GA. Berriasian–Valanginian Geochronology and Carbon-Isotope Stratigraphy of the Yellow Cat Member, Cedar Mountain Formation, Eastern Utah, USA. Geosciences. 2023; 13(2):32. doi.org/10.3390/geosciences130

MDPIBerriasian–Valanginian Geochronology and Carbon-Isotope Stratigraphy of the Yellow Cat Member, Cedar Mountain Formation, Eastern Utah, USAThe Early Cretaceous Yellow Cat Member of the terrestrial Cedar Mountain Formation in Utah, USA. has been interpreted as a “time-rich” unit because of its dinosaur fossils, prominent paleosols, and the results of preliminary chemostratigraphic and geochronologic studies. Herein, we refine prior interpretations with: (1) a new composite C-isotope chemostratigraphic profile from the well-known Utahraptor Ridge dinosaur site, which exhibits δ13C features tentatively interpreted as the Valanginian double-peak carbon isotope excursion (the so-called “Weissert Event”) and some unnamed Berriasian features; and (2) a new cryptotephra zircon eruption age of 135.10 ± 0.30/0.31/0.34 Ma (2σ) derived from the CA-ID-TIMS U-Pb analyses of zircons from a paleosol cryptotephra. Our interpretations of δ13C features on our chemostratigraphic profile, in the context of our new radiometric age, are compatible with at least one prior age model for the “Weissert Event” and the most recent revision of the Cretaceous time scale. Our results also support the interpretation that the Yellow Cat Member records a significant part of Early Cretaceous time.
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Andy :cofe: :bart: :burrito:

A re- #introduction I guess… I’m a transplanted New Englander (#celtics, #redsox) living in the East Bay #sfba. I #hike, #run, #bake, still watch #TheSimpsons, play #ukulele, and make #geologicmaps (#geology, #geomorphology, #tectonics) mostly in the #Mojave desert. I also dabble in cosmogenic nuclide #geochronology to learn about the timing of #Pleistocene #glacier retreat and #landscapeevolution. Earth Science in the Public Service. Toots are my own and not endorsed by any organization.

Public
James Metcalf

Geochronology grant opportunities for graduate students! AGeS3 is back, and has funding opportunities for up to $10,000 for US based graduate students interested in collecting geochronology data. Check out agesgeochronology.org/ for more info, including details on an upcoming zoom informational session.
#geology #geochronology

AGeS3 - Advancing Geochronology Science, Spaces, and SystemsAGeS3 - Advancing Geochronology Science, Spaces, and SystemsUniversity of Colorado Boulder
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Annabirdian

Hello! Excited to be here, though still figuring it all out. I'm a #geologist who uses #geochronology, #geochemistry and #fieldwork. I'm currently trying to answer questions like when and why does it rain in the Sahara, and where is the Archaean basement terrane boundary north of the Scottish mainland? I run the #LAICPMS lab in the University of Hull, am a Deputy Editor in Chief for the #journalofthegeologicalsociety and am a mum of 3. Life is not boring 😵‍💫😴

Public
ksircombe

By way of #introduction… I manage a #geoscience #laboratory acquiring publicly available data for government, communities and industry in #Canberra on the awesome #Ngunnawal country.

A professional fan of #rocks, #minerals, and #geochronology and also spend a lot of my working life on the mysteries of #innovation, #facilitation, #QualityControl and #management.

A big supporter of #geoscience #education #outreach #diversity because we’re all in this together, we all need to know how the planet works and everything just goes better when everyone is included.

Fascinated by lots of #science and #technology especially #gadgets, #3dprinting and #making. Sometimes seen at #archery, #hiking and #scifi.

Occasionally has moments to blog... the-temporal-theodolite.net/

A panorama of a well-lit laboratory space with large tables covered in samples. Shelves and other furniture are visible as well as windows and doors leading to other parts of the laboratory.
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