14 July 2025 The Future is the Product of the Past

490-Million-Year-Old Trilobites Could Solve Ancient Geography Puzzle

The humble trilobites may be extinct, but even as fossils, they can teach us much about our planet’s history. Indeed, ancient arthropods from nearly half a billion years ago, including ten newly discovered species,  may be key to understanding Thailand’s place on the former supercontinent Gondwana.

Trilobites are extinct sea creatures with half-moon-shaped heads that breathed through their legs. A 100-page monograph in the British journal offers great detail about the new species, including one named in honor of Thai Royal Princess Maha Chakri Sirindhorn.

The trilobite fossils were trapped between layers of petrified ash in sandstone, the product of old volcanic eruptions that settled on the sea floor and formed a green layer called a tuff. Unlike some other kinds of rocks or sediment, tuffs contain crystals of zircon — a mineral that formed during an eruption and are, as the name of the rock layer containing them suggests, tough.

Zircon is chemically stable as well as heat and weather resistant. It is hard as steel and persists when minerals in other kinds of rocks erode. Inside these resilient zircon crystals, individual atoms of uranium gradually decay and transform into atoms of lead.

“We can use radio isotope techniques to date when the zircon formed and thus find the age of the eruption, as well as the fossil,” said Nigel Hughes, monograph co-author and UC Riverside geology professor.

It is rare to find tuffs from this particular period of time, the late Cambrian period, between 497 and 485 million years ago. “Not many places around the world have this. It is one of the worst dated intervals of time in Earth’s history,” Hughes said.

Artist's rendering of a trilobite based on preserved soft body parts. (Nobu Tamura)
Artist’s rendering of a trilobite based on preserved soft body parts. (Nobu Tamura)

“The tuffs will allow us to not only determine the age of the fossils we found in Thailand, but to better understand parts of the world like China, Australia, and even North America where similar fossils have been found in rocks that cannot be dated,” said Shelly Wernette, former Hughes lab geologist now at Texas State University, and first author of the monograph.

The fossils were uncovered on the coast of an island called Ko Tarutao. It is about 40 minutes southwest from the mainland via high-speed boat and is part of a UNESCO geopark site that has encouraged international teams of scientists to work in this area.

For Wernette, the most interesting discovery was 12 types of trilobites that have been seen in other parts of the world, but never in Thailand before. “We can now connect Thailand to parts of Australia, a really exciting discovery.”

During the trilobites’ lifetime, this region was on the outer margins of Gondwanaland, an ancient supercontinent that included Africa, India, Australia, South America, and Antarctica.

“Because continents shift over time, part of our job has been to work out where this region of Thailand was in relation to the rest of Gondwanaland,” Hughes said. “It’s a moving, shape shifting, 3D jigsaw puzzle we’re trying to put together. This discovery will help us do that.”

Location of the fossil discoveries. Credit: Shelly Wernette/UCR
Location of the fossil discoveries. Credit: Shelly Wernette/UCR

For example, take the species named for Royal Princess Sirindhorn. The species was named in tribute to the princess for her steadfast dedication to developing the sciences in Thailand. “I also thought this species had a regal quality. It has a broad headdress and clean sweeping lines,” Wernette said.

If researchers can get a date from the tuffs containing her namesake species, Tsinania sirindhornae, and determine when they lived, they will be able to say that closely related species of Tsinania found in northern and southern China are roughly the same age.

Ultimately, the researchers feel that the pictures of the ancient world hidden in the fossils they found contain invaluable information for the present day.

“What we have here is a chronicle of evolutionary change accompanied by extinctions. The Earth has written this record for us, and we’re fortunate to have it,” Hughes said. “The more we learn from it the better prepared we are for the challenges we’re engineering on the planet for ourselves today.”

DOI: 10.1002/spp2.1516

University of California

Cover image: Wikipedia

Related Articles

Archaeologists Found 1,600-year-old Burials of Noble Women and Gold Jewelry in the Mountains of Crimea

4 December 2024

4 December 2024

Archaeologists found burials of noble women filled with gold and silver jewelry in the Crimean mountains in the Bakhchisaray region...

16th-Century Shipwreck Discovered at Record Depth Off French Mediterranean Coast

12 June 2025

12 June 2025

The deepest shipwreck ever documented in French territorial waters has been found over 2,500 meters below the surface. In a...

1,800 years old Sewer system found in ancient city of Mastaura

17 May 2022

17 May 2022

Archaeologists found an 1800-year-old sewer system during excavations in the ancient city of Mastaura, in the Nazilli district of Aydın...

China’s construction of the first archaeological museum which will house the famous Terracotta Warriors has been completed

19 April 2022

19 April 2022

Construction of the first archaeological museum in China’s northwestern province of Shaanxi, which will house the famous Terracotta Warriors, was...

Ancient Footprints Offer Evidence Humans Wore Shoes 148,000 Years Ago

12 September 2023

12 September 2023

A new analysis of ancient footprints in South Africa suggests that the humans who made these tracks might have been...

Archaeologists discovered on Tunisian coast three shipwrecks, one of which 2,000 years old

8 June 2023

8 June 2023

A team of archaeologists from eight countries—Algeria, Croatia, Egypt, France, Italy, Morocco, Spain, and Tunisia bordering the Mediterranean Sea has...

Lidar Technology Reveals a 3,000-year-old Secret Mayan City with Full of Pyramids and Plazas

30 October 2024

30 October 2024

Tulane University researchers used laser-guided imaging to uncover vast unexplored Maya settlements in Campeche, Mexico, revealing more than 6,500 pre-Hispanic...

A First in Türkiye: ‘Pilgrim Dimitrakis’ Inscribed Skull Found in Sinop

1 August 2024

1 August 2024

A male skull with the Greek inscription “Pilgrim Dimitrakis” was found during archaeological excavations at Balatlar Church in Sinop, on...

Unique Scythian glass pendants found in the Poltava region of Ukraine

8 October 2021

8 October 2021

Archaeologists have unearthed unique amphora-shaped pendants near the town of Kotelva in the Poltava oblast of central Ukraine. A team...

Rare Five Bronze Age Axes found in the Forests of Poland

5 December 2023

5 December 2023

Archaeologists in Poland have discovered five Bronze Age axes in Starogard Forest District, located in Kociewie. A metal detectorist named...

Water Cultu in Hittites and Eflatunpınar Hittite Water Monument

4 February 2021

4 February 2021

The Hittites, which left their mark on the Bronze Age period in Anatolia, is a society that draws attention with...

The Headless Corpses of Somersham was Victims of Roman Executions

30 May 2021

30 May 2021

Excavations at Knobb’s Farm in Somersham, Cambridgeshire, unearthed three small late Roman graves on the outskirts of an agricultural village....

Researchers find 3,000-year-old shark attack victim in Japan

24 June 2021

24 June 2021

In a paper published today, Oxford-led researchers reveal their discovery of a 3,000-year-old victim—attacked by a shark in the Seto...

The Oldest Known Neanderthal Engravings were Discovered in a French Cave

13 August 2023

13 August 2023

According to a recent study published, the oldest engravings made by Neanderthals have been discovered on a cave wall in...

The Largest Circular Tomb of the Ancient World Is Opening

16 February 2021

16 February 2021

The restoration of Augustus’ colossal tomb, which is expected to be opened in 2014, has been completed. The Augustus mausoleum...