Fossils dating before 1741
The transition from Hydrodamalis cuestae to H. gigas occurred within two to four million years*)Domning 1978, P. 104. The new species approximately ranged from the Kuriles via the Bering Sea to northern California. For a long period there were very few fossil finds, as the sea rose by more than 100 meters over the last 20.000 years and the coastal areas of those early periods are now well below sea level. Therefore there is also little archeological evidence of sea cow hunting by early humans.
During the last 5,000 years the rise of the sea level slowed down, and some more recent fossils have been found.

i. South of the Aleutian and Commander Islands
ii. On western Aleutians:
Domning writes 2007 "it seems that a population of sea cows quite possibly survived [and were hunted] in the Near Islands into the 18th century" (before the Russian arrival).
Lucien M. Turner*)American naturalist and ethnographer, quoted from Domning 2007 wrote around 1880, that natives of Attu assert that in times about one hundred years ago large marine animals were very abundant around the island, eating seaweed, and were hunted mainly by the native women.
iii. On Bering Island:
1992 Savinietzky made a series of 25 radiocarbon dates of redeposited sea cow bones found in the coastal deposits, dating between 2.400 and 400 years. Whereabouts of these specimen unknown.
Of the remaining available skeletal elements from Bering Island probably only the Helsinki-specimen and some bones in Washington (USNM218376) date from before 1741.
The Helsinki skeleton of a young male is probably also the only available specimen from a single individual. Hampus Furuhjelm, Governor of Russian Alaska, had collected it 1861 on v. Nordmann's*)Nordmann, Alexander von, Director of Zoologic Museum Helsinki request. The museum in Helsinki communicated that the exact age has not yet been analysed.
A skeleton, which 1892 Prof. B. W. Everman bought from a "creole"*)Russian-Alëut half-breed, lay under about 1 meter of sand about 3 kilometre inland, and probably was also a complete skeleton of one individual from the Pleistocene, which once had been thrown far inland by a large wave (Steller reported he had found far and high inland whole sea-cow skeletons, between driftwood and whale bone). Supposedly the specimen should have been donated to the Washington National Museum of Natural History, however, its whereabouts are unknown.

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