Abstract
In 1993, a Franco-Lao field-work team found three levels with dinosaur footprints in Muong Phalane, Savannakhet Province (Laos). The footprints are visible on the bank of the Sang Soy River on a tabular bedded sandstone belonging to the top of the “Grès supérieurs” Formation, dated by the occurrence of fresh water pelecypods (Trigonioidacea) from the end of the Lower Cretaceous. We have registered 13 theropod footprints on the lower slab, 8 footprints of an ornithopod and 38 of sauropods on the medium one, and on the upper one, 2 theropod footprints similar to those of the lower slab. The different trackways allowed us to estimate the speed of the theropod at 5 km/h with a hip-height of 170 cm, and the speed of the ornithopod at 6 km/h with a hip-height of 210 cm. The fades of the sediment collected in Muong Phalane and the occurrence of ripple-marks on the slabs seem to be related to a flood plain.
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