Photography in the United States
In spring 1839, the daguerreotype was introduced into the United States by an Englishman named D.W. Seager, who took the first photograph of a view of St. Paul’s Church and a corner of the Astor House in Lower Manhattan in New York City. Painter and inventor Samuel Finley Breese Morse had met Louis Daguerre in Paris in the spring of 1839, becoming the first American to see his photographic process and becoming enamored with it as a result. When he returned to the United States later that year, he enthusiastically promoted the daguerreotype while hailing Seager's prototypical image. Morse had painted "The Gallery of the Louvre" in 1833, and the appeal of the medium of the daguerreotype was an obvious one to him: it was a means of making faithful copies of artworks, in addition to anything else that would be still in front of the slow eye of the camera.
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.