The Professional Geologist Volume 61 Number 3 INSIDE THIS ISSUE FEATURES


6 Textbook Donation Thank You Dawn Garcia, CPG-8313


9Mary Anning Dennis Pennington, CPG-4401


10The Sonora Paleochannel, a buried Quaternary Au-Te deposit, Hayes Creek, Dawson Range, Yukon Territory, Canada Donald G. Strachan, CPG-10367


19Some Common Misconceptions About


Groundwater Barney Paul Popkin


20Geologist's Relations with State Agencies Peter Dohms, CPG-7141


32Powering the Digital Age Responsibly: Sustainable Data Centre Cooling Solutions Inemesit Ukpanah


JUL.AUG.SEP 2024


34Identifying External Sources of High


PM2.5 Concentrations at Urban Air Monitors: An Application to North-


Central Texas, U.S. Paul F. Hudak


50A word on networking with AIPG Anton A. Smirnov, SA-11492


On the Cover: 2023 Photo Contest Winner - Off the Beaten Path Description: Lava Tube Stalagmites in Iceland. Ice caves formed in lava tubes are not in everyone’s backyard, and the huge, clear stalag-


mites formed from ice that occur in Iceland are spectacular. The stalagmites will melt over the summer but form again when temperatures plunge and the water dripping from the cave roof starts freezing.


Photograph by Dawn Garcia, CPG-8313, Arizona Section, 2023. 2023 Photo Contest: Geologists in Action. Runner Up on page 5.

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