Here are links to references for the two cases I brought up.
Cro magnon
Caramelli D, Lalueza-Fox C, Vernesi C, Lari M, Casoli A, Mallegni F, Chiarelli B, Dupanloup I, Bertranpetit J, Barbujani G, Bertorelle G. Related Articles, Links
Evidence for a genetic discontinuity between Neandertals and 24,000-year-old anatomically modern Europeans.
Proc Natl Acad Sci U S A. 2003 May 27;100(11):6593-7. Epub 2003 May 12.
Mungo Lake
Adcock GJ, Dennis ES, Easteal S, Huttley GA, Jermiin LS, Peacock WJ, Thorne A. Related Articles, Links
Mitochondrial DNA sequences in ancient Australians: Implications for modern human origins.
Proc Natl Acad Sci U S A. 2001 Jan 16;98(2):537-42.Erratum in: Proc Natl Acad Sci U S A 2002 Jan 8;99(1):541.