Posts Tagged ‘tiger sharks are maneaters’

Ancient Shark-bitten Whale Bones off the Coast of South Carolina

March 10, 2015

I may revisit Edisto Island soon to hunt for fossils.  Ocean currents are eroding through Pleistocene and Miocene fossil deposits offshore and occasionally a nice specimen washes ashore.  Scuba divers find the best fossils here, but that sport is a bit too dangerous for my tastes. Most of the South Carolina coast is fossiliferous.  Scientists recently discovered 2 ancient whale skeletons off the South Carolina coast along with many associated shark teeth.

The 1st whale skeleton was found in the Cooper River near Charleston.  The stratigraphic context suggests the specimen is approximately 3.5 million years old.  The remains consisted of a partial skull, cheek bones, ribs, and teeth.  (The authors of the study refer to the whales plates as teeth.  Baleen whales have plates instead of teeth.) They belong to a baleen whale also known as a mysticete.  This doesn’t narrow down exactly which species of whale it was.  There are 15 species of baleen whale including bowhead, right, blue, Bryde’s, minke, fin, sei, humpack, gray, and a few others.  Shark teeth associated with this skeleton were tiger, silky, oceanic whitetip, and sandbar.  There are shark bite marks on the whale remains as well as shark teeth embedded in bone.

The tiger shark (Galeocerdo cuvier) is an impressive predator and a definite man-eater.  They reach a length of 15 feet and a weight of 2000 pounds.  They often prey on sea turtles and can bite through the shell.  The largest bite marks on the whale skeleton are from tiger sharks, though it’s unlikely they’re responsible for the whale’s death.  According to the below referenced paper, the condition of the whale ‘s”tooth” suggests the whale died of old age and the sharks merely scavenged the carcass.

Teeth of the tiger shark

Tiger shark teeth.  Shed teeth of this species associated with whale bones are evidence sharks scavenged a dead whale 3.5 million years ago off the South Carolina coast.  This is also evidence this species is at least that old.

Youtube video of a tiger shark feeding upon a sea turtle.

stylized baleen.jpg (9640 bytes)

Baleen whales have plates instead of teeth.  The plates on 1 of the whales specimens appeared to be from an aged individual, suggesting the whale died of natural causes.  Curiously, the authors of the below referenced paper referred to the plate as a tooth.

The 2nd whale skeleton was found in Port Royal Sound, Laurel Bay, Beaufort County.  It also belongs to a baleen whale of undetermined species and includes cheek, “teeth,” flipper bones, and shoulder blade. This specimen was not found in a stratigraphic context that could give an estimated relative age.  It could be from a few hundred to hundreds of thousands of years old, though the bones and teeth appeared old to the authors.  Associated shark teeth were from tiger, dusky, and sharp-nosed.  The latter species is presently the most common inshore shark at this locality.  Teeth of cownose ray and guitarfish were also found here.  The smaller sharks along with the rays and guitarfish probably fed on the scraps torn free by the larger sharks.


Cicimurri, David; and James Knight

“Two Shark-bitten Whale Skeletons from Coastal Plain Deposits of South Carolina”

Southeastern Naturalist 8 (1) 2009