Assertion: plesiosaur | /r/HasProperty | discovered in this period
Facets:
Source sentences:
text: Whereas during the nineteenth and most of the twentieth century, new plesiosaurs were described at a rate of three or four genera each decade, the pace suddenly picked up in the 1990s, with seventeen plesiosaurs being discovered in this period.
text: Whereas during the nineteenth and most of the twentieth century, new plesiosaurs were described at a rate of three or four genera each decade, the pace suddenly picked up in the 1990s, with seventeen plesiosaurs being discovered in this period.