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Switzerland  2015  "Ammonite"  

Issue Date 05.03.2015
ID Michel:    Scott:  Stanley Gibbons:   Yvert:   UPU:  N/A Category: pF
Author Christian Kitzmüller, Bülach (ZH)
Stamps in set 1
Value CHF 2 -  Colombiceras ammonite
Emmision commemorative
Size (width x height) 105mm x  70mm
Layout Block
Products FDC x1
Paper White stamp paper, with optical,
mat gummed, 110 gsm
Perforation 14
Print Technique Offset, 4 colors
Printed by Gutenberg AG, Schaan, Liechtenstein
Quantity
Issuing Authority La Poste
Ammonite fossil on stamp of Switzerland 2015


On 5 March 2015, Switzerland issued a 2-swiss franc souvenir sheet containing one irregularly shaped stamp depicting an ammonite fossil along with an image showing a reconstruction of how the creature may have appeared when it was living. Official press release, written by Dr. Walter Etter Geoscience Curator Basel Natural History Museum is below:
"When collectors go scouting in the fossil rich layers of the Swiss Jura mountains, they are usually looking for the beautiful spirally coiled ammonites. These fossils are the remains of creatures related to octopus and squid that first appeared around 400 million years ago, spread throughout the world’s oceans, then died out at the same time as the dinosaurs approximately 65 million years ago. Ammonites had an outer shell like a snail, but the inner part of the shell had chambers of the kind we can still see today in the living pearly nautilus. The shell protected the soft parts of their anatomy, while air in the chambers created buoyancy. Ammonite post mark of Switzerland 2015 The septa dividing the chambers were tightly folded at the edge, presumably making the shell better able to withstand water pressure. If the external shell is no longer present or is removed from an ammonite, these folds are marked by ridges known as suture lines. We know that ammonites are more closely related to today’s squid and octopus than the pearly nautilus. We are also familiar with the anatomy of ammonites’ jaws, know that they did not have ink sacs, that they are likely to have fed on small prey, and probably lived a largely hidden existence close to the sea floor. Many questions still remain unanswered, however. Did they have eight or ten tentacles, or perhaps up to 100 like the nautilus? Did their tentacles have suckers? Did the ammonites have powerful large eyes with lenses like living cephalopods? There were a huge variety of ammonites. It is estimated that almost 20,000 different species of ammonite existed, although spread over a period of some 335 million years. There are ones with disc shaped and spherical shells, smooth and ribbed shells, as well as ones adorned with spines and tubercles. Each of these numerous types of ammonite existed for only a short period of time. Ammonites therefore make excellent “index fossils” which can be used to date geological strata. On the basis of its characteristic ribs, the ammonite depicted on the stamp is probably a Colombiceras, a species of ammonite that lived during the Cretaceous period around 120 million years ago."
However, Dr. Hans Ulrich ERNST, author of some books about fossil on stamps, recognized the ammonite depicted on the stamp as Cheloniceras specie. The following pictures illustrate the differences.
Colombiceras specie

Image from Ammonites.fr
Ammonite fossil  on the stamp
Cheloniceras specie
Image from Ammonites.fr

Distinguished from Colombiceras, fossils of Cheloniceras are not found in Switzerland, but mostly in Morocco. Moreover, on closer look on the fossil depicted on the stamp is possible to see some kind of artificial signs, defects on fins for example. Very likely the ammonite is drawn from sculptured ammonite that represent Cheloniceras specie from Lower Aptian strata at Agadir, Morocco. This kind or artificial fossils are common for Morocco
According to Mr. Dr. Ernst, the stamp designer said that he had received this fossil from a friend and he don't know it origin. Pity that Swiss Post missed an opportunity to depict some real local fossil on their stamp and depict Moroccan art object instead.


Products

FDC  Used Cover
Ammonite fossil on stamp of Switzerland 2015
Ammonite fossil on stamp of Switzerland 2015
Official Souvenir Sheet Extra Souvenir Booklet, issued several months after  the stamp issue and in very limited quantity
Ammonite fossil on stamp of Switzerland 2015
Ammonite fossil on stamp of Switzerland 2015
Exhibition Sheet and special Cover produced for Exhibition in London

Acknowledge: Many thanks to Mr. Dr. Hans Ulrich ERNST for his hint about amonite specie.


ReferencesLa Poste,   Die Lupe (Focus on Stamps) 1/2015,   4/2015,   1/2016 
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