Rich and heterogeneous fossil ostracod
fauna in the Ordovician sediment intrusions at Osmussaar Island, Estonia, reveals an ancient impact event.
The rocks of the lower part of the Khadum Formation, underneath the ostracod
layer, are represented mostly by argillites and bituminous-carbonaceous-clayey rocks.
The new research, published this month in the journal Nature, documented the fates of a class of shrimp-like animals called cytheroid ostracods
, among which there are dozens of different species -- some living, some extinct.
US-based scientists analyzed the fossils of thousands of ancient crustaceans called ostracods
, tiny clam-shaped critters that have been on the planet for nearly 500 million years.
The vertebrate remains described herein come from the same section as the 'fish spine' noted by Bastin and Williams (1914) and are associated with fragments of lingulid brachiopods and ostracod
valves, some female with highly 'bumpy' excrescences typical of shallow-water inshore settings (see Siveter 1989).
1840 to 1940 AD, the number of Ostracod
were several to more than ten shells per layer, related with climate and nutrition.
Isotopic dating was performed on calcareous shells of ostracods
contained within tufa samples (Taylor et.
Samples were extracted from southern coasts of Caspian Sea and Boujagh pond by 2 meters cores and packed in the amount of 200 gr based on changes and transferred to laboratory by plastic bags in order to performing sedimentary studies and identifying Ostracodes
"The two ostracod
specimens discovered represent a genus and species new to science, named Pauline avibella," Discovery News quoted Siveter, of the University of Leicester Department of Geology, as saying in a press release.
Bioluminescence in the marine teleost, Porichthys notatus, and its induction in a non-luminous form by Cypridina (ostracod