So far, he said, the accuracy of the spherule age dates is not precise enough to support his hypothesis, although refining the technique and analyzing more spherules may help.
42.
Scientists hope that " Berry Bowl " will have enough of the spherules in close proximity to allow the rover's instruments to determine their composition . _ __
43.
Carbon dating of the carbon spherules mostly gave dates in the future, this was interpreted as an unusual enrichment of the 14 C at the time these deposits were laid down.
44.
If they were of volcanic or impact origin, the spherules would probably concentrate in rock layers that were exposed at the time of those events, the researchers said in a statement.
45.
These concretions are regarded as terrestrial analogues of the hematite spherules, called alternately Martian " blueberries " or more technically Martian spherules, which the Opportunity rover found at Meridiani Planum on Mars.
46.
These concretions are regarded as terrestrial analogues of the hematite spherules, called alternately Martian " blueberries " or more technically Martian spherules, which the Opportunity rover found at Meridiani Planum on Mars.
47.
Muller said he hoped to find evidence in the spherule ages of a 26 million-year period of increased cratering impacts that might have been triggered by his " Nemesis " star.
48.
The specimen displayed an unusual " black material " around the base of the tail, containing several calcium carbonate spherules, suggesting a quite noticeable amount of muscle behind the animal's hips.
49.
"These spherules hit the Earth far earlier than any other meteoric material we have, and yet they are in an excellent state of preservation, " said University of Washington astronomer Don Brownlee.
50.
This supports the notion that they grew in place, since if their origin was related to volcanic or meteoric episodes one would expect layers of spherules as a " record in time " for each event.
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