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Palaeontology and dinosaurs (science, public domain) Public domain

Evolution Premium T-shirt

Ammonites · Unisex premium cotton T-shirt, 142 gsm

Ammonites, premium cotton T-shirt in black

32.95 €

VAT included · shipping 4.29 € to

Delivery in 3-4 working days arrives between 8 and 9 October

Colour and size

Colour black

Size

Secure payment with Stripe · 14 days to return it · 3 years by guarantee

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It is printed in the European Union, not on the other side of the world: it arrives with no customs, no import charges and no month at sea on the way. Delivery times measured against the printer on 19 August 2026.

More designs from Evolution

3 designs for Evolution, on the same premium t-shirt and at the same price.

Ammonites Ammonites La cadena de Merian La cadena de Merian Lámina de Hawkins, 1854 Lámina de Hawkins, 1854

Printed on premium cotton T-shirt. The last thumbnail is the original print the design comes from.

Where it comes from: source, motifs and legal status
Source
Palaeontology and dinosaurs (science, public domain)
Motifs
T. rex skeleton · Victorian scientific plate · the amber with the mosquito · Mary Anning and the first fossils · the ammonite · lithograph by Hawkins (1854)
Legal status
Public domain. The design is ours; the material it starts from belongs to everyone
The whole collection →

What this premium T-shirt is like

It is a Bella + Canvas 3001 in combed, ring-spun cotton, 142 gsm. That is fine fabric: the T-shirt you wear on its own in summer and under something the rest of the year, the one that does not bulk up under a shirt. The cut is unisex and straight, with a side seam and shoulder-to-shoulder taping, which is what keeps the neck from going wavy after ten washes.

Read more about this premium t-shirt

The drawing goes on one side only, on the chest, printed straight onto the fabric with water-based inks. It is not a vinyl stuck on top: you cannot feel it when you run your hand over it, it does not crackle when you fold it and it has no edge for it to start peeling from. In exchange the ink lives inside the cotton and ages with it, so after many washes it loses a shade of black, like any well-made printed T-shirt.

Inside out, at 30 °C, no bleach, and never iron over the print. Of the whole catalogue this is the piece that will go through the washing machine most often, and that is why it is the one that gains most from those three rules. Being a light fabric, it can be slightly sheer in white and in light colours: if you want more body, the same design is there on a sweatshirt.

«Ammonites» is also on t-shirt, 23.95 € · mug, 26.95 € · poster, 32.95 € · women's t-shirt, 33.95 € · sweatshirt, 54.95 € · hoodie, 61.95 €

The drawing on «Ammonites»

An ammonite shell coiled on itself: three turns of spiral, the radial ribs crossing it from the inside out, the umbilicus at the centre and the open mouth of the last chamber. A fossil drawn as a fossil, not as spiral decoration.

Where this drawing comes from

What is drawn is a fossil, not a pretty spiral: that is why the umbilicus at the centre and the open mouth of the last chamber are there, which is where the animal came out.

The spiral is not traced: it is calculated. It is the logarithmic spiral r = a·k^(θ/2π) with a growth ratio of 2.55 per turn, which is that of the genus Dactylioceras of the Lower Jurassic. Jacob Bernoulli called it «spira mirabilis» in 1692 for precisely that property, and D'Arcy Thompson gives it chapter XI of «On Growth and Form» (1917).

Where this design comes from →

What you ask us before buying

Is the spiral traced from a fossil?
It is calculated, not traced: a logarithmic spiral with a growth ratio of 2.55 per whorl, which is the one of the genus Dactylioceras from the Lower Jurassic. And what is drawn is a fossil, with its umbilicus at the centre and the last chamber open, not a decorative spiral with a few stripes added on.
How does this T-shirt run?
It is a straight unisex cut, not fitted. If you like it snug, take your size; if you want it loose, go up one. The measurements in the table are of the garment laid flat, not of your body: the way to get it right is to measure a T-shirt of your own that already fits the way you want.
Does the print peel off?
There is nothing to peel off: the ink is printed straight onto the cotton, water-based, so there is no edge that can lift. What it does do over the years is lighten a touch. Washing it inside out at 30 °C is what holds that back most.
How long does it really take?
3 to 4 working days, printing and shipping included — the same lead time the rest of the site gives, because there is only one. The piece is made in the European Union, and that is where the lead time comes from. Above, over the button, you have the exact date for this one. The table below says where each size is made.
How much is shipping?
The page itself says so, above the button, before you pay and for whichever destination you pick in the dropdown. To Spain it is 4.29 €. The amount comes from the same rate the checkout charges, not from a separate list.
Can it be returned?
Yes. You have 14 days to withdraw without giving reasons — it is not a personalised product, so the right of withdrawal covers you — and 3 years of legal guarantee. If it arrives faulty or badly printed, we redo it or give you your money back. How it is made.
Where does the drawing on «Ammonites»?
The spiral is not traced: it is calculated. It is the logarithmic spiral r = a·k^(θ/2π) with a growth ratio of 2.55 per turn, which is that of the genus Dactylioceras of the Lower Jurassic. Jacob Bernoulli called it «spira mirabilis» in 1692 for precisely that property, and D'Arcy Thompson gives it chapter XI of «On Growth and Form» (1917). It is in the public domain: the drawing is ours, the material it starts from belongs to everyone.
Who is selling?
Flexibles y Accesorios Gobe, S.L. · CIF B56727993. Prices include VAT.

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32.95 € Ammonites · premium t-shirt