Geological Sciences | Science Communication
Not only is the Morton Gneiss of Minnesota absolutely gorgeous, it’s also really freaking old. Zircon crystals in the gneiss have been dated to ~3.6 Ga [that’s 3.6 billion years old!] At their age, these rocks are from the Archean Eon, the second eon in Earth’s history (the Hadean is the first), which lasted from… Continue reading Minnesota Morton Gneiss
Due in large part to the lasting legacy of Christopher Columbus’s expeditions, North and South America will forever bear the mark of the “New World.” Whereas Europe has cathedrals centuries older than the United States itself, North America appears to not be able to offer much in terms of relics of antiquity. The earliest humans… Continue reading Some perspective on (geologic) time [w/ the Acasta gneiss!]
Emily Zawacki, Ph.D. 