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This is Scientific American 60-Second Science. I'm Emily Schwing. Got a minute?
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It's long been thought mammoths and mastodons rambled over North America's arctic and subarctic realms between 75,000 and 100,000 years ago, and were made extinct by hungry new arrivals on the scene: human beings.
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But new evidence indicates mastodons probably roamed the region as far back as 120,000 years ago, and they were gone before the first people showed up.
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"For at the least the story of the mastodon, we now know for what we call Beringia, Alaska, parts of Yukon and over into northeastern Asia,
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they were wiped out in those areas for things that had nothing to do with humans, because they all died out before there were humans there."
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Pat Druckenmiller is the Curator of Earth Science at the University of Alaska Museum of the North.
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"Humans could not have been part of the story and that's pretty interesting."
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The research is in the Proceedings of the National Academy of Sciences.
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Druckenmiller and co-authors were led to these conclusions after colleagues at the Yukon Paleontology Program in Canada decided to redate nearly forty thousand specimens,
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because American mastodons are often mistaken for their much hairier wooly mammoth cousins, who hung around the area later.
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"A mammoth and a mastodon can be immediately distinguished on the basis of their teeth, their big cheek teeth.
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The surface of a mammoth tooth looks like a washboard, perfect for grinding grasses that grew during the last ice age.
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But mastodon teeth have much lumpier, bumpier cusps: ideal for chewing twigs and leaves.
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"People in the past when they found these teeth and bones, they put glue and other kinds of strange things on them,
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that glue can mess up the dates, gives you a wrong date.
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In fact, it gives you a date that's too young."
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The new dates corroborate what mastodon teeth show:
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They ambled over Beringia when the region was warmer and forested, long before mammoths and earlier than humans.
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So, if humans didn't wipe out the mastodon, what did?
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That mystery remains for scientists to sink their teeth into.
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For Scientific American 60-Second Science. I'm Emily Schwing.
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1 / 21
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显示原文 =This is Scientific American 60-Second Science. I'm Emily Schwing. Got a minute?
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2 / 21
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显示原文 =It's long been thought mammoths and mastodons rambled over North America's arctic and subarctic realms between 75,000 and 100,000 years ago, and were made extinct by hungry new arrivals on the scene: human beings.
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3 / 21
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显示原文 =But new evidence indicates mastodons probably roamed the region as far back as 120,000 years ago, and they were gone before the first people showed up.
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4 / 21
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显示原文 ="For at the least the story of the mastodon, we now know for what we call Beringia, Alaska, parts of Yukon and over into northeastern Asia,
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5 / 21
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显示原文 =they were wiped out in those areas for things that had nothing to do with humans, because they all died out before there were humans there."
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6 / 21
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显示原文 =Pat Druckenmiller is the Curator of Earth Science at the University of Alaska Museum of the North.
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7 / 21
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显示原文 ="Humans could not have been part of the story and that's pretty interesting."
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8 / 21
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显示原文 =The research is in the Proceedings of the National Academy of Sciences.
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9 / 21
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显示原文 =Druckenmiller and co-authors were led to these conclusions after colleagues at the Yukon Paleontology Program in Canada decided to redate nearly forty thousand specimens,
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10 / 21
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显示原文 =because American mastodons are often mistaken for their much hairier wooly mammoth cousins, who hung around the area later.
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11 / 21
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显示原文 ="A mammoth and a mastodon can be immediately distinguished on the basis of their teeth, their big cheek teeth.
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12 / 21
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显示原文 =The surface of a mammoth tooth looks like a washboard, perfect for grinding grasses that grew during the last ice age.
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13 / 21
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显示原文 =But mastodon teeth have much lumpier, bumpier cusps: ideal for chewing twigs and leaves.
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14 / 21
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显示原文 ="People in the past when they found these teeth and bones, they put glue and other kinds of strange things on them,
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15 / 21
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显示原文 =that glue can mess up the dates, gives you a wrong date.
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16 / 21
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显示原文 =In fact, it gives you a date that's too young."
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17 / 21
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显示原文 =The new dates corroborate what mastodon teeth show:
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18 / 21
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显示原文 =They ambled over Beringia when the region was warmer and forested, long before mammoths and earlier than humans.
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19 / 21
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显示原文 =So, if humans didn't wipe out the mastodon, what did?
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20 / 21
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显示原文 =That mystery remains for scientists to sink their teeth into.
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21 / 21
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显示原文 =For Scientific American 60-Second Science. I'm Emily Schwing.
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