Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 9 · column 5 of 7 · from the scan, no model involved
Australia later separated from Antarctica, Australian marsupials became isolated and a magnificent subsequent radiation there produced the familiar kangaroos, koalas, wombats and other unique modem forms.
Latin roots
South America was also the source of our beloved Virginia opossum, whose ancestors returned to North America only recently (about 3 million years ago in the Pliocene) when the Isthmus of Panama formed a land bridge between North and South America. This land bridge also permitted movement of northern placental mammals into the south, and many of the endemic southern mammals, some marsupials
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