Daguerreotype
It is said that Daguerre has found the means to collect, on a plate prepared by him, the image produced by the camera obscura, in such a way that a portrait, a landscape, or any view, projected upon this plate by the ordinary camera obscura, leaves an imprint in light and shade there, and thus presents the most perfect of all drawings ... a preparation put over this image preserves it for an indefinite time ... the physical sciences have perhaps never presented a marvel comparable to this one.
A further clue to fixing the date of invention of the process is that when the Paris correspondent of the London periodical "The Athenaeum" reported the public announcement of the daguerreotype in 1839, he mentioned that the daguerreotypes now being produced were of considerably better quality than the ones he had seen "four years earlier".
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.