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Qualität des Beitrags: Beteiligte Poster: infoshark Forum: SHARK-FORUM Forenbeschreibung: Treffpunkt für Haifans! aus dem Unterforum: Allgemein Thema Hai und Umwelt Antworten: 1 Forum gestartet am: Mittwoch 01.11.2006 Sprache: deutsch Link zum Originaltopic: Shark teeth keep walkers, divers going Letzte Antwort: vor 16 Jahren, 9 Monaten, 28 Tagen, 14 Stunden, 40 Minuten
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Re: Shark teeth keep walkers, divers going
infoshark - 20.06.2007, 11:41Shark teeth keep walkers, divers going
Shark teeth keep walkers, divers going
Fossils found on shore, riverbeds, ocean bottom
Some people like to dive for them; others like to comb the beaches for them. In either case, there is a tremendous attraction for oceanic fossilized sharks' teeth that range from 50 to 25 million years old.
Ken and Donna Capps have gotten their exercise while hunting these fossils for the past 20 years.
"We liked to walk the beach years for exercise anyway," Donna Capps said. "Then we got tuned in to hunting for sharks teeth. At first, they were hard to spot. They're so tiny. We never find the big ones, and usually they're very black, so they look just like rocks or pebbles."
The tiny teeth found along the Grand Strand beaches are black because they have been fossilized.
"What this means is that the teeth minerals have been replaced by other, different minerals," said Erin Burge, a professor in Coastal Carolina University's department of marine science. "After these millions of years, most traces of the original minerals are gone. They are petrified."
Burge is a shark-teeth hobbyist like the Cappses. His collection, however, consists of much larger fossils. They are larger because he finds many of them while diving in the Cooper River near Charleston.
"I'm not a shark expert; my area is molecular marine biology," he said. "I study sea creatures (crabs, shrimp, fish) that might be in jeopardy; I might be diving for samples when I spot the teeth."
He says the larger teeth are far from the coast because they are heavy and tend to stay closer to where they erode than the smaller teeth that wash up on shore.
Robbie Curry, as a diving professional, gets lots of exercise. He works for Coastal Scuba & Little River Fishing Fleet. If he isn't taking clients out for scuba diving, he is out on the fishing boat trolling or bottom fishing with clients. They take clients to dive in two areas, Barracuda Alley (an old reef area where the ocean is 63 feet deep) and to another area called the Sherman, a Civil War shipwreck (53 feet deep). Both are due east of Little River. There, lots of sea creatures nestle and Curry spots recent sharks' teeth all the time, but not the megalodons or fossils.
"These are more recent teeth, leftovers from predatory battles in the ocean. I spot them, but I leave them. But I don't see the really old teeth where we go, usually. Of course, I do pick up other relics from the ocean floor."
Curry is in the ocean often - about 95 dives a month in the summer while he is working. He said neither sharks nor barracudas bother him at all.
"I swim with sand tigers, bull sharks and black tips all the time. Barracudas are so used to me with scuba gear that they rub up against my tank. The types of shark teeth I see are just young - 10 to 20 years old maybe."
The Cappses don't want to swim with the sharks but do enjoy their huge collection of the fossils.
"This is our primary type of exercise," Donna Capps said. "We're certainly not divers, but we can walk a good 10 mile stretch each weekend and sure look forward to renourishment."
The Cappses say the best time to find sharks' teeth is when high tide is coming in and churning up the water.
"But we find them all the time, especially around the piers," she said. "There are always little pebbles, rocks and sharks' teeth lurking there."
Burge said the different colors of sharks' teeth - from dark ebony to tawny tan - depend on the riverbed sediments they are deposited in; they become fossilized according to the color of the sediment around them.
A scientist can open one of the teeth and measure the radioactive isotopes in them to determine a specific age, Burge said. Most are from the Miocene Age, about 5 million to 25 million years ago.
Sharks go back 100 million years; today there are about 400 species of sharks, with perhaps 2,000 to 3,000 species that are extinct, according to Burge.
"On our Grand Strand beaches, we tend to find teeth from about five species," he said.
"I like them even more now that I know the ages," said Donna Capps.
"That makes them more precious to us."
Quelle: Myrtle Beach Online
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