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California workers uncover 40-million-year-old fossils, possibly thunder beast

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TOI World Desk. (2026, September 27). California workers uncover 40-million-year-old fossils, possibly thunder beast. Times of India. https://timesofindia.indiatimes.com/world/us/california-construction-workers-uncover-40-million-year-old-fossils-they-could-belong-to-extinct-thunder-beast-or-swamp-rhino/articleshow/134498996.cms

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Times of India · collected 2026-09-27 · by TOI World Desk

Quick Summary

Workers in Oceanside, California, unearthed fossilized remains of a large mammal dating back 40 million years during routine infrastructure work. Dr. Joseph El Adli, the city’s principal paleontologist, identified several limb bones and ribs belonging to either a brontothere or an amynodont, both extinct rhino-sized mammals from the Eocene Epoch. The fossils were carefully extracted over seven days and are now being studied off-site by experts who aim to determine which species they belong to while keeping the exact location undisclosed for protection.
Written by AI on 2026-09-27, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

During routine construction work for an infrastructure project in Oceanside, California, workers uncovered fossilized bones dating back around 40 million years. The City of Oceanside announced that these remains were found about 12 feet below the surface and could belong to a prehistoric "thunder beast" or a "swamp rhino," both large hoofed mammals from the Eocene Epoch. Paleontologists, including Dr. Joseph El Adli, who identified the site during monitoring, are now studying these fossils further. The city has not disclosed the exact location of the discovery to protect it from unauthorized digging that could damage additional fossil remains still in the ground.

Written for “Thunder Beast Fossil Discovery Califo…” on 2026-11-04, grounded in this article and the 1 other(s) covering the same event.

Story

📰 Thunder Beast Fossil Discovery Califo…
Science · 2 article(s) covering the same event. See how they differ ↓

Compared with similar articles

This article reads unscored and hedges 18% of its claims. Each row says how that neighbour differs.
Times of India
Hedges 11 of 38 claims Outlet record 59/100
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
17
sentences that state something as happening or true
Uncertain
18%
3 of 17 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
59/100
Times of India's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
2
Science
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-09-27 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

Times of India · 4056 article(s) · 4 correction(s) detected
Running correction rate · 4 correction(s)

Who wrote this

TOI World Desk
1406 article(s) here · 1 carrying a prediction
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Topics

California Oceanside San Diego County the City of Oceanside

Subjects

the City of Oceanside ORG · 2× California GPE · 1× El Adli PERSON · 1× Joseph El Adli PERSON · 1× Oceanside GPE · 1× San Diego County GPE · 1×

Narrative

The City of Oceanside is currently withholding the exact location of the discovery to protect both public safety and the integrity of the site (Image: City of Oceanside Site) What Member C of the Santiago Formation reveals about the fossils' Eocene-era age The bones were recovered from Member C of the Santiago Formation, a thick sequence of sedimentary rocks exposed across parts of northwestern San Diego County.
framing: assertive · carried by 1 article(s) · first seen 2026-09-27
🔮 The city has kept the exact location under wraps; other outlets that covered the release reported this is meant to protect the site from unauthorised digging that could damage further fossils still in the ground.
2026-09-27 · Times of India
California workers uncover 40-million-year-old fossils, possibly thunder beast · assertive framing

Claims (17 extracted, 3 hedged)

Workers on a routine infrastructure project in Oceanside, California, recently uncovered the fossilised remains of a large, hoofed mammal that lived tens of millions of years ago. asserted
that → uncover → years
The significant find, which included several limb bones, ribs and numerous other bones and fragments, was uncovered approximately 12 feet below the surface during routine excavation for a city infrastructure project, according to the City of Oceanside. uncertain
which → include → Oceanside
A palaeontologist now believes the bones belong to one of two extinct, rhino-sized mammals that roamed North America during the Eocene Epoch. asserted
that → believe → Epoch
Why the fossils were unearthed during routine monitoring of a construction project Joseph El Adli, PhD, the city's principal palaeontologist, discovered the site during routine monitoring and immediately secured the area to begin additional excavation. asserted
Adli → unearth → excavation
The city has kept the exact location under wraps; other outlets that covered the release reported this is meant to protect the site from unauthorised digging that could damage further fossils still in the ground. uncertain
that → keep → ground
His team worked over a period of seven days to expose the fossil bones from beneath several tons of hardened mudstone and sandstone before encasing them in a plaster field jacket for safe transport to an off-site laboratory for eventual preparation. Could the bones belong to a rhino-sized 'thunder beast' Based on the size and shape of the bones uncovered during the excavation, Dr El Adli believes they likely belonged to an animal from one of two extinct mammal families that once roamed North America, both of which belong within the order Perissodactyla, the odd-toed hoofed mammals. uncertain
both → work → Perissodactyla
The first possibility is a brontothere, sometimes called a titanothere or "thunder beast." asserted
possibility → call → ?
They were land-dwelling creatures that fed on soft leaves and vegetation in forested habitats. asserted
that → dwell → habitats
The particular species known from this rock formation was roughly the size of a modern black rhino. asserted
species → know → rhino
The second possibility is an amynodont, historically referred to as a "swamp rhino." asserted
possibility → refer → rhino
Amynodon had hornless faces and squat, hippopotamus-like bodies, with low, barrel-shaped torsos, short sturdy legs, a broad flat skull, and tusk-like canine teeth rather than a horn. asserted
Amynodon → have → horn
Some amynodons were semi-aquatic, spending much of their time wallowing in rivers, ponds, and lakes and grazing on coarse aquatic and streamside vegetation, while others were more lightly built and lived on land. asserted
others → spend → land
The City of Oceanside is currently withholding the exact location of the discovery to protect both public safety and the integrity of the site (Image: City of Oceanside Site) What Member C of the Santiago Formation reveals about the fossils' Eocene-era age The bones were recovered from Member C of the Santiago Formation, a thick sequence of sedimentary rocks exposed across parts of northwestern San Diego County. asserted
bones → withhold → County
The formation dates to the Eocene Epoch and has previously yielded fossils from that time period within the city, as well as elsewhere in the region. asserted
formation → date → region
Based on the surrounding rock and known organisms from the formation, palaeontologists estimate the specimen lived roughly 40 to 45 million years ago. asserted
specimen → base → formation
What happens next for the newly discovered Oceanside fossils The fossils, now encased in plaster field jackets, have been transported off-site for lab preparation. asserted
fossils → happen → preparation
Other outlets that reviewed the city's release reported that technicians will eventually free the bones from their plaster jackets and the surrounding hardened mudstone, then stabilise them with glues and resins so they can be preserved, to eventually place them in a museum collection where scientists and the public can study them. asserted
scientists → review → them
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