to a diverse group of
cephalopods which include the squid, cuttlefish and octopus,
they are characterized by an internally chambered shell known as a guard. Looking
like bullets or orange pens,
is found in abundance at Big Brook and one of the species that survived
nearly to the end of the
Cretaceous period. The forward part of the guard (the back is the
pointed end) has a V shaped chamber which was used for buoyancy control.
Casts of these chambers called phragmocones
are often mistaken for teeth.
can occur in huge numbers in some localities in so-called belemnite
Belemnites average between 1 and 2 inches reaching
upwards of 4 inches.
Pictured are the typical stream finds
Scale 1 inch
Monmouth County, NJ
These belemnites were found split like this. This
gives a good view of the chamber
used for buoyancy control.
Internal casts of the chambers are common and easily mistaken for teeth
Unlike shark teeth the casts are "cone like" with two ridges running
down the sides.
A group of large beleminites, the top one measures 4
These were found where a large section of the stream wall had collapsed
due to natural erosion.
Belemnitella has a pointed tip. Stream wear
quickly breaks these off,
finding one with the tip intact is uncommon