Material Tested Triceratops,MT Triceratops,MT Hadrosaur,MT Hadrosaur,MT Hadrosaur,MT Hadrosaur,MT Hadrosaur,MT Hadrosaur,MT Hadrosaur,AK Allosaurus.CO Allosaurus,CO Acrocanthosaurus,TX Acrocanthosaurus,TX | RadioCarbon age 30,890 +/-200 33,830 +2910/-1960 22,380 +/-800 22,990 +/-130 25,670 +/-220 25,170 +/-230 23,170 +/-170 2,560 +/-70 31,050 +230/-200 16,220 +/- 220 31,360 +/-100 23,760 +/-270 25,760 +/-280 | Fraction measured Collagen, modified Longin Method, AMS Organics, pretreated acid, alkali, acid,CL Organics, pretreated acid, alkali, acid.CL Organics, pretreated acid, alkali, acid,AMS Bioapatite, AMS Charred bone,AMS Collagen Modified longin method.AMS Humic acid alkali fraction,AMS Purified organics Bio-apatite,C Bio-apatite (purified with HAc),AMS Bio-apatite,AMS Bio-apatite,AMS | Sample from Internal bone material Outer bone material Internal bone material Outer bone material Internal bone material Internal bone material Internal bone material Internal bone material ------------- -- ----------------- ----------------- bone surface scraping very large sample size |