SKOWHEGAN — A Farmington man has been indicted by a Somerset County grand jury on 16 counts of rape of a child, some alleging compulsion and threats.

Joseph L. Magee, 40, of Lamkin Lane remains at Franklin County jail on $100,000 cash bail. A jail intake officer in Farmington said Magee is being held on a probation violation.

According to the indictment, the assaults involve two girls — one who was under 14 years old, the other under 18 — beginning in June 2014 and lasting until April of this year. They occurred in Skowhegan, according to the grand jury report.

Eight of the charges are listed as Class A felonies, punishable by up to 30 years in prison on each charge, if convicted. Eight other charges are Class B felonies, punishable by up to 10 years in prison on each charge, if convicted.

There also is a misdemeanor charge of domestic violence assault on one of the children.

One of the girls told police that Magee threatened her with a hammer when he raped her, according to Farmington police Detective Marc Bowering’s affidavit filed with a Franklin County court.

Bowering interviewed Magee and he “admitted to having sex” with one of the teenagers “anywhere from 60 to 70 times in the last year or two,” Bowering wrote.

Farmington police arrested Magee in April.

Assistant District Attorney Roswell Fichthorn in Skowhegan was granted a motion to impound the affidavit, which spells out the details of the charges against Magee, for 60 days.

A court hearing is set for Aug. 29 in Skowhegan. The tentative trial date is Nov. 5.