Silent sentinels

These oddities are  on Curracloe beach. At first glance they look like the remains of a man made structure  but I THINK they are actually trees. This area used to be thickly forested but has suffered badly from coastal erosion.You can see some dead trees up on the dune. It is now part of a nature reserve. All along this beach efforts are being made to replant the dunes.
I think they are spiky enough for todays mono monday challenge.