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| Fig. 1: Yours truly at the Zoological Museum of Zürich, standing next to a model of Plateosaurus engelhardti, a dinosaur that may or may not be similar to Gressylosaurus, though read on (Image taken by my girlfriend). |
For a project of mine I may or may not be working on, I have lately been researching various fossil discoveries made in Switzerland. I have undoubtedly come across some major surprises, for example the discovery of a genuine terror bird, so far the only legit one from Europe, in Egerkingen. Today I will however talk about the somewhat disconcerting history of the little-known genus Gresslyosaurus. The first time I heard of its name I admittedly had to grin a little, as Gressly sounds a bit like “grässlich”, the German word for awful. Gressly is however the name of a person, Amanz Gressly, who dug the bones of this dinosaur out in Niederschöntal (today Füllinsdorf) in the Kanton of Basel-Landschaft and sent them to Ludwig Rütimeyer in the year 1856. To give you a feel for the time period, Switzerland under its current constitution was by that point only eight years old, having recently survived a civil war and the rule under Napoleon. Rütimeyer at first thought these bones belonged to Belodon, a genus of phytosaur, but in 1857 announced that these remains actually represented the first dinosaur fossils known from Switzerland. To honor its discoverer he named the species Gresslyosaurus ingens. Similar to the prosauropod Efraasia it was originally considered a relative of Teratosaurus, a genus infamously thought to have either been the first “carnosaurian” theropod or a large, carnivorous prosauropod, until in the 1980s it was realized to have actually been a rauisuchian crocodile-relative. In the following decades at least three other species were assigned to Gresslyosaurus, G. plieningeri, G. robustus and G. torgeri. The reason why most of you have probably never heard of this genus is Peter Galton, who in 1986 re-examined the bones excavated by Gressly and concluded that the genus is synonymous with the already known species of Plateosaurus, a dinosaur in Switzerland now better known from the Gruhalde quarry in Aargau. This has been generally accepted by workers ever since those days.
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Fig. 2: Rütimeyer’s original sketches of the Gresslyosaurus fossils. |
But who was Amanz
Gressly, the discoverer of these fossils? Born 1814 in Bärschwil, Kanton Solothurn,
Gressly originally studied medicine, but in 1834 decided to instead follow his
true passion, geology. He taught himself the practice entirely autodidactically
and together with friends amassed an impressive private collection of fossils. His
personality was generally described as very odd and shy, but also exceptionally
intelligent, nice and cordial. While I am definitely not an expert on these
matters, based on some of the descriptions it seems plausible that today
Gressly’s personality might be placed somewhere on the autism-spectrum. Louis
Agassiz, well known for discovering the existence of the ice ages as well as
his work on fossil fish, became aware of Gressly and his collection when the
latter moved to Neuchatel in 1836. He decided to make Gressly his assistant,
borrowing some parts of his collection for his works and even naming the clam
genus Gresslya after him. During his time as Agassiz’s assistant Gressly
wrote Observations geologiques sur le Jura Soleurois in 1841, which was
significant for the history of geology, as in it Gressly was the first
scientist to use and define the term facies (used to describe the general
characteristics of a rock layer), which laid the groundwork for all later
stratigraphy. In the same work he also gave birth to the study of
biostratigraphy and paleoecology, discovering that the Jurassic mountains once
used to be a shallow sea of reefs. Unfortunately, the completion of this work
left a heavy toll, as Gressly suffered a mental breakdown shortly after, which
his mental institution made him recover from through an extended stay in the
city of Solothurn. Meanwhile, between the years 1833 and 1844, Louis Agassiz
had been working on Recherches sur les Poissons Fossiles (Research on
the Fossil Fish), a monumental five-volume treatise, which also included parts
of Gressly’s collection. The production, illustration and printing of this
project made Agassiz accumulate a massive debt and instead of paying off said
debt, he fled Switzerland and departed to the United States of America in 1846,
founding the Museum of Comparative Zoology at Harvard University. During his
last years in America Agassiz became most well-known for his unflattering
influence on “scientific” racism, such as his ideas on multiregionalism (the notion that the human ethnicities all independently evolved from each other out
of different ape species), and also his critiques of Darwinian evolution. In case
you were not convinced yet that Agassiz was a less than amicable person, during
his exodus to the States he also took with him some of the best fossils from
Gressly’s collection, apparently without the consent of the owner. This
betrayal by his former mentor and idol burned Gressly out on Neuchatel, already
disliking the city for many years (relatable), making him leave it shortly
after. The following ten years he spent his life as what can only be described
as a nomadic scientist, travelling through, and apparently even living in the wild
parts of the Jurassic mountain side, studying rocks and fossils and only
settling down for short times in Solothurn and surrounding cities to write and
publish papers on what he had found. In these years this wild scientist of the mountains
became beloved by the local populace and his colleagues, his sloppy clothes and
wild-growing beard becoming his trademark. His obituary in the London
Geological Magazine makes him almost sound like a real-life Gandalf:
“He was a child
of the people, loved and known by all. Possessing vast knowledge and most
profoundly acquainted with the structure of our mountains, yet was he simple
and unostentatious. Gressly had no enemies, envy and jealousy had no place in
his heart; he was, as it were, an echo of another age. No one was more popular
than he in the Jura; from the Perthe-du-Rhône to the Rhine there was not a
village in which he did not count friends, and where his arrival was not
saluted with acclamations.” (Stampfli 1986, p. 19).
In the 1850s his Enkidu-years came to an end as he was hired by the Swiss Central Railway as a geologic surveyor. The geologic profiles he made were integral to the construction of the Hauensteintunnel, one of the oldest railways in Switzerland. During his years working for railway-projects in the alps, nearly all his geologic predictions were proven correct during the tunnel constructions, even earning him the respect of the Geological Society of London. The beginning of the 60s Gressly spent with travelling to Southern France as well as Iceland to study, respectively, their marine life and geology.
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| Fig. 3: Amanz Gressly with his trademark beard. The photograph was taken in the 1860s, when he had become more sedentary again. |
Unfortunately, the
story does not have a happy ending. Throughout his life Gressly had been
plagued by mental health issues, his breakdown in 1841 only being one of many.
In 1864 he had to go into treatment at the Universitäre Psychiatrische Dienste
Bern, commonly referred to as the Waldau. What exactly he was suffering from is
hard to say nowadays, as the study and treatment of mental disorders was still
very rudimentary in the nineteenth century. The Waldau was commonly referred to
as an Irrenhaus, meaning a lunatic/insane asylum, which at this time would have
mainly been occupied with keeping its patients away from society, rather than
giving them therapy and rehabilitating them. One of the few accounts of his
life there and the reason why I am even writing this article, I discovered by
complete coincidence. It comes from Die Urwelt der Schweiz (The Primeval
World of Switzerland), written by Oswald Heer. Heer was a well-renowned
paleobotanist and entomologist working at the University of Zürich and the
Polytechnikum (which would later become the ETH) as well as a big idol to none
other than Charles Darwin. His book, originally published in 1865, is a monumental
work which details the geologic and fossil record of the country known at the
time from the Coal Age all the way to modern day. It is also filled with tons
of great paleoart by the author, even if most of it consists of plants,
landscapes and bugs. In the passage describing animals from the Triassic he
wrote a few sentences about Teratosaurus and how a fossil found by Amanz
Gressly, the Gresslyosaurus, is likely the same animal. In
what is merely a footnote he then mentions:
“Der arme Gressly, welcher in Wahnsinn verfallen,
ins Irrenhaus gebracht werden musste, wurde von dem Gedanken gequält, dass er
in diesen Gresslyosaurus verwandelt worden sei.” (Heer 1865, p. 66).
Which means
translated:
“Poor Gressly,
who, falling into insanity, had to be brought to the lunatic asylum, was
agonized by the thought that he had transformed into this Gresslyosaurus.”
Heer does not
provide a source for this claim, but considering that he knew Gressly
personally, he is likely telling some version of the truth here, which has
absolutely disturbing implications. The discovery of Gresslyosaurus was
perhaps one of the most minor parts of Gressly’s life, so how come then that
this dinosaur occupied such a large part of this person’s mind, that in an
unstable state he came to think he had turned into it?! Was it simply because
the dinosaur was named after him or was there something more bizarre going on? Was
it something about the bones or the circumstances of the discovery itself? There
is something very eerie about all of this, an untold backstory that a
talented writer could probably construe into Lovecraftian dimensions. We may
never know what has led to these circumstances, as Gressly took the secret with
him to the grave. After initial improvements, he died on the thirteenth of
April 1865 of a stroke, still at the Waldau. He was buried in Solothurn, where
he liked to reside the most, his gravestone reading:
“Gresslius interiit lapidum consumptus amore,
Undique collectis non fuit hausta fames.
Ponimus hoc saxum.
Mehercle! totus opertus
Gresslius hoc saxo, nunc satiatus erit.”
Which roughly
means:
“Here lies Gressly, who died through his odd love of stones,
Which he collected in his house, but did not satiate
his hunger.
Let us place this stone. By God! Covered whole in
stone,
Lying between stone, Gressly now has enough stones.”
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Fig. 4: A megalith in the Verena Hermitage Gorge, with an engraving honoring Amanz Gressly. Yes, you read that right, a megalith. According to info-plaques at the place, the rock itself was not placed in Gressly’s honor but was erected inside the gorge in ancient times by iron age people, presumably Celts (Image taken by me). |
Gressly is still beloved and well-remembered by Swiss paleontologists
and geologists today. Multiple memorials have been erected in his honor
throughout Kanton Solothurn, one of which you can see above. Even a street is
named after him. Since 2004 the Schweizerische Paläontologische Gesellschaft
gives the Amanz-Gressly-Award to people who have done extraordinary work in
paleontology. In 2020 the sauropod Amanzia greppini was also
named after him (the species name honoring Swiss paleontologist Jean-Baptiste Greppin). Up to that point this species, which was found in Moutier, Kanton
Bern, was originally classified as Ornithopsis greppini, before
that as a Cetiosauriscus and even before that as a Megalosaurus,
as an associated Ceratosaurus tooth was once assumed to be part of the
same animal. As for the fate of Gresslyosaurus? Galton’s assessment that
the genus is the same as Plateosaurus was not accepted uncritically,
already being criticized in 2003 due to significant differences in the
vertebrae. In 2020 Oliver Rauhut and Heinz Furrer re-examined a load of
prosauropod bones from Schleitheim, Schaffhausen, which had previously all been
labelled Plateosaurus and were then largely forgotten. In their analysis
they identified and named a completely new species among the remains, Schleitheimia
schutzi, which unlike Plateosaurus was a quadrupedal
sauropodiform very close to the origin of true sauropods (and also considerably larger). In the same paper
they also re-examined the Gressly fossils and noted that, while the data is
very fragmentary, the fossils do indicate a prosauropod that was very distinct
from Plateosaurus and either was its own genus or is possibly
synonymous with Schleitheimia (in the latter case the name Gresslyosaurus
would have priority due to being older). The bones are currently being
re-preparated for further study, but until then it does seem like the taxon is
indeed valid again, in one form or another. In other words:
Gresslyosaurus has risen from the grave!
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Related
Posts:
My
Trip to the Dinosaur Museum of Frick
Fossil
Hunting in the Jura Mountains of Holderbank
Literary Sources:
Hartmann, Alfred: Amanz Gressly, in: Gallerie
berühmter Schweizer der Neuzeit. Band 1, Baden 1868.
Heer, Oswald: Die Urwelt der Schweiz, Zürich 1865 (2. Edition
1883).
Rieppel, Olivier:
Mesozoic Sea Dragons. Triassic Marine Life from the Ancient Tropical Lagoon of
Monte San Giorgio, Bloomington 2019.
Stampfli, Hans: Amanz Gressly. 1814–1865. Lebensbild
eines ausserordentlichen Menschen, Solothurn 1986.
Papers:
Image
Sources:
Fig. 2: Meyer 2003
Fig. 3: Wikimedia
