An ancient bone fragment holds clues
How did dogs get to the Americas? An ancient bone fragment holds clues.
The history of dogs has been intertwined, since ancient times, with that of the humans who domesticated them. But how far back does that history go in the Americas and which route did dogs use to enter that part of the world?
A U.S. National Science Foundation-funded study led by researchers at the University at Buffalo provides insight into these questions. The results show that a bone fragment found in Southeast Alaska belongs to a dog that lived in the region about 10,150 years ago. Scientists say the bone a piece of a femur represents the oldest confirmed remains of a domestic dog in the Americas.
An ancient bone fragment holds clues
How did dogs get to the Americas? An ancient bone fragment holds clues.
March 2, 2021
The history of dogs has been intertwined, since ancient times, with that of the humans who domesticated them. But how far back does that history go in the Americas and which route did dogs use to enter that part of the world?
A U.S. National Science Foundation-funded study led by researchers at the University at Buffalo provides insight into these questions. The results show that a bone fragment found in Southeast Alaska belongs to a dog that lived in the region about 10,150 years ago. Scientists say the bone a piece of a femur represents the oldest confirmed remains of a domestic dog in the Americas.
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On a beach on a remote island in eastern Papua New Guinea, a country located in the southwestern Pacific to the north of Australia, garnet sand reveals an important geologic discovery. Similar to messages in bottles that have traveled across the oceans, sediments derived from the erosion of rocks carry information from another time and place. In this case the grains of garnet sand reveal a story of traveling from the surface to deep into the Earth (~75 miles), and then returning to the surface before ending up on a beach as sand grains. Over the course of this geologic journey the rock type changed as some minerals were changed, and other materials were included (trapped) within the newly formed garnets. The story is preserved in garnet compositions, as well as in their trapped inclusions: solids (e.g., very rare minerals such as coesite – a high pressure form of quartz), liquids (e.g., water) and gases (e.g., CO2).
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IMAGE: Suzanne Baldwin, Thonis Family Professor, examining a gneiss, a type of metamorphic rock on a field expedition to Goodenough Island, Milne Bay Province, Papua New Guinea. view more
Credit: Photo credit: Professor Paul Fitzgerald
On a beach on a remote island in eastern Papua New Guinea, a country located in the southwestern Pacific to the north of Australia, garnet sand reveals an important geologic discovery. Similar to messages in bottles that have traveled across the oceans, sediments derived from the erosion of rocks carry information from another time and place. In this case the grains of garnet sand reveal a story of traveling from the surface to deep into the Earth (~75 miles), and then returning to the surface before ending up on a beach as sand grains. Over the course of this geologic journey, the rock type changed as some minerals were changed, and other materials were included (trapped) within the newly formed garnets. The story is preserved i