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References for works on the use of light scattering to distinguish
between gastroliths and non-gastroliths are posted below. The general
conclusion from these articles is that the degree of polish on
gastroliths is measurably different, using light scattering techniques,
from that of stream polished rocks. The causes of the higher polishing is
not investigated, but the contribution of digestive acids is suspected to
play a role along with abrasion during gizzard contractions.
JOHNSTON, R.G., K. MANLEY, and C.L. LEMANSKI. 1990. Characterizing
gastrolith surface roughness with light scattering. Optics
MANLEY, K. 1991. Two techniques for measuring surface polish as applied
to gastroliths. Ichnos, 1:313-316.
MANLEY, K. 1993. Surface polish measurement from bona fide and supsected
dinosaur gastroliths and wave and stream transported clasts. Ichnos.
JOHNSTON, R.G., W.G. LEE and W.K. GRACE. 1994. Identifying Moa
gastroliths using a video light scattering instrument. Journal of