. Royal Ontario Museum expedition of 1921, Red Deer River near Little Sandhill Creek. LEFT TO right: two assistants, Chinese cook, G. E. Lindblad, L. Sternberg, Dr. W. A. Parks (visiting). , No. 46586. Collecting was shifted to the Edmonton formation in 1922. A fourth man was added to the permanent staflf, John Rickett of Toronto. The northern Red Deer River badlands were explored from the vicinity of Big Valley to the area around Morrin ferry. Specimens collected included the skull of a hooded duck-billed dinosaur (Hypacrosaurus), the incomplete skull of a horned dinosaur (Anchiceratops
. Royal Ontario Museum expedition of 1921, Red Deer River near Little Sandhill Creek. LEFT TO right: two assistants, Chinese cook, G. E. Lindblad, L. Sternberg, Dr. W. A. Parks (visiting). , No. 46586. Collecting was shifted to the Edmonton formation in 1922. A fourth man was added to the permanent staflf, John Rickett of Toronto. The northern Red Deer River badlands were explored from the vicinity of Big Valley to the area around Morrin ferry. Specimens collected included the skull of a hooded duck-billed dinosaur (Hypacrosaurus), the incomplete skull of a horned dinosaur (Anchiceratops), and the almost complete skeleton of a small dinosaur related to the duck-billed dinosaurs {Parkso- saurus warreni). The last is remarkable in that much of the backbone of the tail is reinforced by a lattice of ossified tendons, which must have made this appendage more or less rigid, a curious condition in a small dinosaur. Levi Sternberg was given a year's leave of absence from the in 1923. His father, although 71 years of age, had begun in 1921 a success- ful programme of fossil collecting in the Upper Cretaceous of the San Juan basin, New Mexico. With his son's help he continued work here in 1923. Meanwhile the palaeontological expeditions of the were continued under the leadership of Lindblad. In 1923 and 1924 the area between Morrin and Munson ferries was explored. The best find of 1923 was the almost complete skeleton of a large duck-billed dinosaur {Edmontosaiirus regciUs). The type of a new horned dinosaur {Arrhinoceratops hrachyops) was also found, and the skeleton of the hind limbs and pelvic region of a flesh-eating dinosaur (type of Albertosaurus arctunguis). In 1924 another duck-billed dinosaur skeleton was obtained {Anatosaurus edmontoni). Also noteworthy in the collection of that year was the skeleton of the hind legs and pelvis of a bird-mimic dinosaur (type of Struthiomimus hrevitertius). Sternberg returned to the in 1924 and in 1925 led
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