Geographical distribution in history

Early work was in Europe: first eight genera (28 years) all European until Massospondylus (Lesotho, Africa) became the first non-European dinosaur in 1854.
Europe dominated dinosaur genus counts for 65 years from 1825-1889.
By 1890, North America had overtaken Europe, and has remained ahead ever since.
45-year gap between Asia's first and second dinosaurs (Titanosaurus in 1877; then three in 1923)
In 1993, Asia overtook North America as most diverse continent.

Early work was in Europe: first eight genera (28 years) all European until Massospondylus (Lesotho, Africa) became the first non-European dinosaur in 1854.