Ammonite Fossil Description PDF Print E-mail

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Example of Ammonites in the Rock Professor

AMMONITES

AMMONITE–AN EXTINCT SUBCLASS OF THE CEPHALOPOD CLASS OF THE PHYLUM MOLLUSCA (Mollusks). Present-day cephalopods include the octopus, squid and nautilus, which is the closest in appearance to the ammonite. Ammonites ranged in time from approximately 400 million years(Devonian) until about 65 million years.(late Cretaceous). Their chambered shells are found today, while their soft bodies, which occupied the largest and outermost chambers, are gone. The septa, plates which divide the chambers, are highly visible in cut fossilized ammonite specimens.

Ammonites had a tube called a siphuncle, which carried water from outside the shell to the chambers, and was used to propel the ammonite as well as to change its depth in the water. Cephalopods, such as the ammonite, were swimming mollusks, rather than attached (pelecypods) or bottoms dwelling(gastropods) mollusks.

The ammonites showed an increasingly complex pattern of sutures on their shells as time went by. Sutures are the intersections of the septa and the outer shells.

Ammonite shells: originally composed of aragonite; after fossilization, the shell becomes calcite.

Ammolite: some of the original shells retained their mother of pearl nacre over the centuries, which during fossilization, was chemically transformed into an iridescent material called ammolite (aragonite with varying mineral impurities).

Localities:  include Russia, England, Morocco, U.S., Madagascar.

 

Drawing of ancient living AMMONITE

Drawing of an
ancient living
ammonite

 

Image of Sculptured Ammonite on Base, FSL 235

Sculptured Ammonite on Fossil Matrix Base,
$96.00
FSL 235

Ammonite, cut and polished halves, FSL 236

Ammonite, cut and polished halves,
$72.00
FSL 236

 

Image of Ammonite Pair, FSL 248

Ammonite Pair
$62.00
FSL 248

Image of AMMONITE PAIR, FSL 1585

Ammonite Pair
FSL 1585
$9.95

Image of Ammonite, FSL 161

Ammonite,
$225.00
FSL 161

Image of Ammonite Gonaitite, FSL 361

Ammonite Gonaitite,
$220.00
FSL 361

Image of Ammonite Orthoceras Sculpture, FSL 566

Ammonite Orthoceras Sculpture,
$40.00
FSL 566

Image of Ammonite Orthoceras Sculpture, FSL 565

Ammonite Orthoceras Sculpture,
$36.00
FSL 565

Image of Ammonite Orthoceras Sculpture, FSL 567

Ammonite Orthoceras Sculpture,
$38.00
FSL 567

Image of AMMONITE FOSSIL, FSL 729

Ammonite Fossil,
FSL 729
$40.00
Image of AMMONITE FOSSIL, FSL 730 Ammonite Fossil,
FSL 730
$19.55
Image of AMMONITE PAIR IN BOX, FSL 589

Ammonite Pair
in Bamboo Box
FSL 859
$9.95

Image of AMMONITE PAIRS, FSL 956

Ammonite Pairs
Package of 5
FSL 956
$20.00

Image of AMMONITE PENDANT, JWL 1067

Ammonite Pendant
JWL 1067
$79.00

Image of AMMONITE PENDANT, JWL 1066

Pyritized Ammonite Pendant
JWL 1066
$49.00

Image of AMMONITE PENDANT, JWL 1068

Ammonite Pendant
JWL 1068
$69.00

Image of AMMONITE PENDANT, JWL 1069

Pyritized Ammonite Pendant
JWL 1069
$49.00

Image of AMMONITE PENDANT, JWL 1070

Pyritized Ammonite Pendant
JWL 1070
$39.00

Image of AMMONITE PENDANT, JWL 1071

Pyritized Ammonite Pendant
JWL 1071
$49.00

Image of AMMONITE, FSL 1146

Ammonite with Opalescent
FSL 1146
$12.00

Image of AMMONITE, FSL 1147

Ammonite with Opalescent
FSL 1147
$14.00

Image of AMMONITE, FSL 1148

Ammonite with Opalescent
FSL 1148
$16.00

Image of AMMONITE, FSL 1149

Ammonite with Opalescent
FSL 1149
$10.00

Image of AMMONITE PENDANT, JWL 1374

Ammonite Pendant
JWL 1374
$29.00

Image of TOURMALINATED QUARTZ PENDANT, JWL 1188

Tourmalinated Quartz Pendant with Ammonite
JWL 1188
$70.00

Image of AMMONITE FOSSIL PAIR, FSL 1221

Ammonite Pair
FSL 1221
$12.50

Image of AMMONITE GONIATE FOSSIL, FSL 1265

Ammonite Goniatite
FSL 1265
$90.00

Image of AMMONITE GONIATITE, FSL 1488

Ammonite Goniatite
FSL 1488
$180.00

Image of AMMONITE PENDANT, JWL 1493

Ammonite Pendant
JWL 1493
$89.00

Image of AMMONITE, FSL 1503

Ammonite Goniatite
FSL 1503
$240.00

Image of PYRITIZED AMMONITE, JWL 1846

Pyritized Ammonite Pendant
JWL 1846
$45.00

Image of PYRITIZED AMMONITE, JWL 1847

Pyritized Ammonite Pendant
JWL 1847
$70.50

Image of PYRITIZED AMMONITE, JWL 1848

Pyritized Ammonite Pendant
JWL 1848
$49.95

Image of PYRITIZED AMMONITE, JWL 1849

Pyritized Ammointe Pendant
JWL 1849
$49.95

Image of PYRITIZED AMMONITE, JWL 1850

Pyritized Ammonite Pendant
JWL 1850

Image of AMMONITE AMMOLITE CAB, FSL 1855

Ammonite Ammolite Cab
FSL 1855
$40.00

Image of AMMONITE AMMOLITE CAB, FSL 1856

Ammonite Ammolite Cab
FSL 1856
$45.00

 
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