The Magic School Bus in the Time of the Dinosaurs 
Ms Frizzle is taking her lucky class to a dinosaur dig to look for Maiasaura nests. But, as soon as the kids get to fossil country, the magic school bus turns into a time machine and transports them back to prehistoric times when dinosaurs roamed the earth.

About The Author
Joanna Cole (born August 11, 1944), who also writes under the pseudonym B. J. Barnet is a United States author of children’s books who teaches science. She is most famous as the author of The Magic School Bus series of children's books.

Cole was born in Newark, New Jersey, and grew up in nearby East Orange. She loved science as a child, and had a teacher she says was a little like Ms. Frizzle. She attended the University of Massachusetts and Indiana University before graduating from the City College of New York with a B.A. in psychology. After some graduate education courses, she spent a year as a librarian in a Brooklyn elementary school. Cole subsequently became a letters correspondent at Newsweek, and then a senior editor for Doubleday Books for Young Readers.