Daguerreotype
Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images. In the late 20th century, there was a revival of daguerreotypy by a small number of photographers interested in making artistic use of early photographic processes.
Daspletosaurus
The type specimen of "Daspletosaurus torosus" (CMN 8506) is a partial skeleton including the skull, the shoulder, a forelimb, the pelvis, a femur and all of the vertebrae from the neck, torso and hip, as well as the first eleven tail vertebrae. It was discovered in 1921 near Steveville, Alberta, by Charles Mortram Sternberg, who thought it was a new species of "Gorgosaurus". It was not until 1970 that the specimen was fully described by Dale Russell, who made it the type of a new genus, "Daspletosaurus", from the Greek δασπλής ("dasplēs", stem and connective vowel resulting in "dasplēto"~) ("frightful") and "σαυρος/sauros" ("lizard"). The type species is "Daspletosaurus torosus", the specific name "torosus" being Latin for 'muscular' or 'brawny'. Aside from the type, there is only one other well-known specimen, RTMP 2001.36.1, a relatively complete skeleton discovered in 2001. Both specimens were recovered from the Oldman Formation in the Judith River Group of Alberta. The Oldman Formation was deposited during the middle Campanian stage of the Late Cretaceous, from about 77 to 76 Ma (million years ago). A specimen from the younger Horseshoe Canyon Formation in Alberta has been reassigned to "Albertosaurus sarcophagus". Another specimen from the Horseshoe Canyon Formation may be referrable to "Daspletosaurus", but this has not been confirmed or rejected yet.