Mastodon or Mammoth?

One hundred and twenty-seven years ago, two 12-foot tusks were unearthed in Grove City in a pit where a company manufactured clay tile. A partial skull and teeth were also found. The remains were identified as a Mastodon by a professor from the Ohio State University but an examination of the photo might indicate the find was misidentified, instead being a Mammoth. [Note the shovel in upper left for size comparison.] Mastodon tusks have a slight curve; the Mammoth tusk has a more dramatic curve. The find was uncovered in an area behind St. John’s Lutheran Church on Columbus Street. What do you think, Mastodon or Mammoth? Source: A History of Grove City, Ohio