Study: Scant evidence that ‘wood overuse’ at Cahokia caused local flooding, subsequent collapse
The remains of the most sophisticated prehistoric native civilization north of Mexico are preserved at Cahokia Mounds State Historic Site. (Photo: Joe Angeles / Washington University)
April 8, 2021 SHARE
Whatever ultimately caused inhabitants to abandon Cahokia, it was not because they cut down too many trees, according to new research from Washington University in St. Louis.
Archaeologists from Arts & Sciences excavated around earthen mounds and analyzed sediment cores to test a persistent theory about the collapse of Cahokia, the pre-Columbian Native American city in southwestern Illinois that was once home to more than 15,000 people.
Geologists Day 2021: 7 Geologists You May Want To Know About
KEY POINTS
Geology helps us better understand our planet
Below are some key geologists throughout history
On Geologists Day, observed on April 4 this year, let s celebrate geologists and thank them for their all-important work.
Holidays to celebrate people in different
professions give us a chance to appreciate their work and contributions. In the case of geologists, their field is often under-appreciated despite the importance of the work they do, Days of The Year (DOTY)
Geologists Day, traditionally celebrated every first Sunday of April, is the perfect time to show our appreciation for the field and the people who are part of it. After all, it is through their work that we are able to understand our own planet better.
Jian Xu; Xiao-Ping Xia; Qiang Wang; Christopher J. Spencer; Bin He .
Abstract:
The mechanisms and processes by which subducted slab interacted with mantle
plume remain controversial, as direct observation of such interaction is
difficult to impossible. Compositional heterogeneity of large igneous
provinces (LIPs) additionally makes plume-slab interaction hard to detect.
Oxygen isotopes are sensitive enough to trace the source of magmas. Here we
provide evidence for plume-slab interaction mainly based on in situ zircon
Hf-O isotope analyses, as well as whole-rock elemental and Sr-Nd-Hf isotope
analyses, on the Late Permian and Early Triassic A-type granites on the
margin of the Emeishan LIP in SW China. These granites show typical A-type
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