- 1864 - Maria Gordon was born in Monymusk, Scotland.
- 1891 - Joseph Leidy died in Philadelphia, Pennsylvania, USA at age 67.
- 1991 - Beverly Halstead died.
First Evidence of Dinosaurian Secondary Cartilage in the Post-Hatching Skull of Hypacrosaurus stebingeri (Dinosauria, Ornithischia)
Alida M. Bailleul, Brian K. Hall, John R. Horner
published 30 Apr 2012