DINOS PUSHED UP DAISIES, according ABC News in
Science 11 August 2015 and PNAS doi: 10.1073/pnas.1423653112. A group
of scientists from Argentina, New Zealand and UK have found fossil pollen grains
in rocks from the eastern side of the Antarctic Peninsula. The pollen belongs to
the plant family Asteraceae, the group that includes asters, daisies,
sunflowers, chrysanthemums, dandelions, and gerberas. The researcher team
described their discovery: “Here we report the discovery of pollen grains
unambiguously assigned to Asteraceae that remained buried in Antarctic deposits
for more than 65 million years along with other extinct groups (e.g. Dinosaurs,
Ammonites). Our discovery drastically pushes back the assumed origin of
Asteraceae, because these pollen grains are the oldest fossils ever found for
the family”. The rocks containing the pollen grains are dated as 66-76 million
years old. The pollen has been identified as belonging to an extinct species
named Tubulifloridites lillei. The scientists also comment in the
summary of their research: “Asteraceae (or Compositae) are regarded as one of
the most influential families in the diversification and evolution of a large
number of animals that heavily depends on their inflorescences to survive (e.g.
bees, hummingbirds, wasps)”.
Link: ABC
Link: ABC
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