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| 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 |
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.
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 depicting 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 depicting on the stamp as Cheloniceras specie. The following pictures illustrate the differences.
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Image from Ammonites.fr |
Ammonite fossil on the stamp |
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Distinguished from Colombiceras, fossils of Cheloniceras are not found in Switzerland, but mostly in Morocco. Moreover, on closer look on the fossil depicting 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.
| FDC | Used Cover |
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| Official Souvenir Sheet | Extra Souvenir Booklet, issued several months after the stamp issue and in very limited quantity |
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| Exhibition Sheet and special Cover produced for Exhibition in London | |
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Acknowledge: Many thanks to Mr. Dr. Hans Ulrich ERNST for his hint about amonite specie.
References: Die Lupe (Focus on Stamps) 1/2015, 4/2015, 1/2016
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