4.5" Trilobite Mortality Plate Fossil Devonian Age 400 Million Years Old COA

Location: Morocco

Weight: 14.4 Ounces 

Dimensions: 4.5 Inches Long, 3.4 Inches Wide, 1.4 Inches Thick (Matrix) 

Comes with a Certificate of Authenticity.

The item pictured is the one you will receive.

What Are Trilobites?

Trilobites are an extinct group of marine arthropods belonging to the class Trilobita. They are among the earliest known arthropods in the fossil record and are widely regarded as some of the first complex animals to appear on Earth.

When Did Trilobites Live?

Trilobites first appeared around 521 million years ago during the Early Cambrian period, near the beginning of the Paleozoic Era. They thrived for over 270 million years before going extinct at the end of the Permian period—long before the rise of dinosaurs.

Where Did Trilobites Live?

Trilobites inhabited Earth’s ancient oceans worldwide. They occupied a wide range of marine environments, from shallow coastal shelves to deeper offshore seabeds. Some species crawled along the ocean floor, others burrowed into sediment, and a few may have swum in the water column.

Why Are Trilobites Important?

Trilobites are crucial index fossils, meaning their presence helps geologists identify and date Paleozoic rock layers. Because different trilobite species lived during specific time intervals, their fossils are essential for understanding:

• Early arthropod evolution

• Cambrian biodiversity

• The rapid diversification of complex life

They provide key evidence of early marine ecosystems.

What Made Trilobites Unique?

Trilobites were among the first animals to develop a hard, calcified exoskeleton. This protective outer shell allowed them to fossilize exceptionally well, making them one of the most abundant fossil groups ever discovered.

Why Are They Called Trilobites?

The name “trilobite” means “three-lobed”, referring to their body structure, divided lengthwise into:

• A central axial lobe

• Two symmetrical pleural lobes

This distinctive three-part division is visible in nearly all trilobite fossils.

How Was a Trilobite’s Body Structured?

The trilobite body was divided into three major anatomical regions:

• Cephalon (Head): Contained compound eyes, antennae, and mouthparts

• Thorax: A flexible middle section with 2–61 articulated segments

• Pygidium (Tail): A fused rear shield for protection

Some trilobites could even enroll, curling into a tight ball for defense—similar to modern pill bugs.

Why Are Trilobite Fossils So Common?

Because of their durable exoskeletons, trilobites fossilized easily. Over millions of years, they diversified into thousands of species, making them one of the most abundant, diverse, and scientifically significant fossil groups in the world.

Today, trilobite fossils are prized by paleontologists, educators, and fossil collectors for their exceptional preservation and evolutionary importance.

Please be aware of the nature of fossils:

Being buried under tons of pressure for millions of years makes fossils rough. No fossil emerges perfect; most are restored or altered to improve presentation. Moroccan workers are professional in unearthing and preserving treasures, though surface cracks are visible—part of their natural beauty, not defects.