kehidupan laut Jurassic yang sangat terawetkan ditemukan di situs fosil yang baru-
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berita artikel terkait tentang jurassic,fosil,situs,situs fosil,laut
kehidupan laut Jurassic yang sangat terawetkan ditemukan di situs fosil yang baru
Tanggal:
25 Januari 2017
Sumber:
University of Texas di Austin
Ringkasan:
Sebuah harta yang sangat diawetkan dari fosil laut Jurassic ditemukan di Kanada,
yang jarang untuk merekam spesies bertubuh lunak yang biasanya
tidak memfosil, memperluas pandangan para ilmuwan 'dari kehidupan laut
yang kaya periode.
....................................
Sebuah harta yang sangat diawetkan dari fosil laut Jurassic ditemukan di Kanada,
yang jarang untuk merekam spesies bertubuh lunak yang biasanya tidak memfosil,
memperluas pandangan para ilmuwan 'dari kehidupan laut yang kaya periode.
Pelestarian fosil - yang meliputi bagian tubuh yang lembut serta kerang dan
tulang - peringkat situs di antara sumber kualitas
tertinggi Jurassic (berusia 183 juta tahun) fosil laut di dunia,
dan satu-satunya situs sepertinya di Amerika Utara .
Sebuah makalah yang menjelaskan situs dan fosil dipublikasikan
secara online dalam jurnal Geology pada bulan Januari.
Kehadiran jaringan lunak fosil sangat signifikan karena menawarkan pandangan
yang lebih lengkap dari kehidupan di ekosistem kuno dan dapat membantu
mengisi kesenjangan dalam pengetahuan yang menghubungkan organisme punah
dengan yang hidup hari ini, kata Rowan Martindale,
seorang profesor di The University of Texas di Austin Jackson School
of Geosciences yang memimpin penelitian tentang fosil.
....................................
label
Exceptionally preserved Jurassic sea life found in new
fossil site,kehidupan laut
Jurassic yang sangat terwetkan ditemukan
di situs fosil yang baru,Jurassic,lobster,Ya Ha Tinda,jackpots
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Exceptionally preserved Jurassic sea life found in new
fossil site
Date:
January
25, 2017
Source:
University
of Texas at Austin
Summary:
A trove of exceptionally preserved Jurassic marine fossils
discovered in Canada, rare for recording soft-bodied species that normally
don't fossilize, is expanding scientists' view of the rich marine life of the
period.
....................................
A trove of exceptionally preserved Jurassic marine fossils discovered in
Canada, rare for recording soft-bodied species that normally don't fossilize,
is expanding scientists' view of the rich marine life of the period
The preservation of the fossils -- which include soft body parts as well as
shells and bones -- ranks the site among the highest quality sources of
Jurassic (183 million year old) marine fossils in the world, and the only such
site in North America. A paper describing the site and fossils recovered from
it was published online in the journal Geology in January.
The presence of fossilized soft tissue is especially significant because it
offers a more complete view of life in ancient ecosystems and can help fill the
gaps in knowledge connecting extinct organisms to those living today, said
Rowan Martindale, a professor at The University of Texas at Austin's Jackson
School of Geosciences who led research on the fossils
"In a normal fossil deposit, you only preserve a fraction of the
organisms that were alive in the past. When you get an extraordinary fossil
deposit with soft tissues preserved, you see significantly more of the
community that would have been alive," said Martindale, a paleontologist
in the Department of Geological Sciences. "Normally, we wouldn't find many
of the animals because they lack a skeleton or have a very soft skeleton."
Collaborators include researchers from Harvard University, Virginia Tech
and Florida State University.
The new site was found on the Parks Canada Ya Ha Tinda Ranch near Banff
National Park in southwest Alberta. Co-author Benjamin Gill, a professor at
Virginia Tech, spotted the first exceptional fossil when he noticed his Ph.D.
student and co-author, Theodore Them, standing right on top of a lobster
"The lighting was just right to make out the outline of the
lobster," Gill said. "Then we looked around and noticed fossils all
around us.
The lobster was the first sign the site could be special because lobsters'
flexible exoskeletons usually aren't preserved as fossils. Other unusual
fossils recovered from the site include delicate shrimp, complete fish
skeletons with scales and gills, large dolphin-like marine reptiles called
ichthyosaurs, as well as "vampyropods" (related to modern vampire
squid and octopus) with their delicate ink sacks still intact.
The presence of many well-preserved, soft-bodied animals marks the new site
as a "Konservat-Lagerstätte," a term for fossil beds that preserve an
array of organisms with soft tissues as well as hard ones. These sites are
rare. There are only three other sites, all located in Europe, that are known
to contain fossils from the Early Jurassic like the Ya Ha Tinda site. Another
famous example of a Canadian Lagerstätte is the Burgess Shale, which preserves
a community of soft tissue organisms from the Cambrian Explosion (540 million
years ago), named for the burst of animal diversity that appears in the fossil
record from this time.
The new site is about 183 million years old, meaning the fossilized life
was alive during the Early Jurassic. At this time, Ya Ha Tinda and the
similarly aged European sites were on opposite sides of an ancient continent
that became modern-day North America and parts of Europe. Having an array of
well-preserved fossils from marine ecosystems on opposite sides of the
continent will help scientists understand the distribution of sea life millions
of years ago.
"This is the first time we have a site like this outside of Europe, so
the Ya Ha Tinda fossilized community will give us a unique snapshot of life in
the Early Jurassic Panthalassa Ocean," Martindale said.
The researchers have been visiting the site every summer since 2013 and
have recovered dozens of fossils, including some that are probably newly
discovered species. Notable specimens include a lobster with bulky arms capped
with diminutive, scissor-like claws, and 16 new vampyropod specimens, a number
that Gill estimates increases known diversity of specimens from North America
by threefold.
"Every time we've gone, we've found something new," Gill said.
"It's a really abundant place."
The next step of the research is to investigate how so many diverse
organisms were fossilized together. Researchers think that the high-quality
preservation is related to a widespread extinction of marine life caused by a
period of extremely low levels of oxygen in parts of the Jurassic oceans. Free
of most scavengers, these low oxygen areas could have been an ideal place for a
carcass to lay undisturbed and become beautifully fossilized.
"If a carcass sinks into anoxic water, you're more likely to get the
conditions that will favor the preservation of soft tissues, feathers and
articulated skeletons," Martindale said. "These 'fossil jackpots' are
really special."
Story Source:
Journal Reference:
1.
Rowan C. Martindale, Theodore R. Them, Benjamin C. Gill, Selva M.
Marroquín, Andrew H. Knoll. A new Early Jurassic (ca. 183 Ma) fossil
Lagerstätte from Ya Ha Tinda, Alberta, Canada. Geology, 2017; G38808.1
DOI:10.1130/G38808.1
