A 12-year-old girl sustained a head injury when a gravestone toppled onto her during a school field trip to a cemetery in Rockford.

The Grand Rapids Press and WWMT-TV report the North Rockford Middle School sixth-grader was among about 60 students at Rockford Cemetery on Wednesday when she was hurt.

The girl's name and condition weren't released. Authorities say she was taken by ambulance to a hospital.

Rockford City Manager Michael Young says students were using crayons to rub imprints of gravestones onto paper at the cemetery about 12 miles northeast of Grand Rapids.

Rockford Public Schools says the trip was part of an effort to bring to life the Natalie Babbitt novel "Tuck Everlasting," which the students had been reading in English class.