A king-sized theropod coprolite Author Karen Chin United States Geological Survey, 345 Middlefield Road, MS 975, Menlo Park, California 94025, USA Author Timothy T. Tokaryk Eastend Fossil Research Station, Royal Saskatchewan Museum, Box 460, Eastend, Saskatchewan S 0 N 0 T 0, Canada Author Gregory M. Erickson Department of Integrative Biology & Museums of Vertebrate Zoology and Paleontology, University of California, Berkeley, California 94720, USA Author Lewis C. Calk United States Geological Survey, 345 Middlefield Road, MS 975, Menlo Park, California 94025, USA text Nature 1998 1998-06-18 393 680 682 journal article 21498 10.1038/31461 7e32cdfa-1a01-4a80-8b35-3c3e6d946e38 3943146

Table 1 X-ray-fluorescence data of the weight percentage of oxides found in bulk powdered samples of the coprolite and host sediment

Coprolite Host sediment.............................................................................................................................................................................
The clay-rich sediment reflects the low phosphorus concentration of most inorganic rocks, whereas the coprolite is largely composed of biotically concentrated phosphorus and calcium.
SiO2	7.93	70.2
Al2O3	2.43	18.1
TiO2	0.128	0.794
FeO	0.95	6.02
MnO	0.151	0.018
CaO	44.6	0.97
MgO	0.16	1.42
K2O	0.27	2.22
Na2O2	0.28	1.08
P2O5	26.5	0.70
Total 83.5 100.9.............................................................................................................................................................................