Euclid Creek flows over bedrock more than 360 million years old.
This includes the 365 million year old Chagrin Shale, the 360 million year old Cleveland Shale, the 358.9 million year old Bedford Formation, the 360 million year old Berea Sandstone, and the 354.8 to 351.4 million year old Orangeville Shale of the Cuyahoga Formation.
The Berea Sandstone is highly resistant to erosion, and the highest waterfalls on Euclid Creek occur where the stream has cut down to the Berea.

Topographically, the underlying geology creates three distinct areas: The Allegheny Plateau, the Portage Escarpment, and the Erie Plain.
The headwaters of both the main and east branch are located on the Allegheny Plateau.
The two streams descend over the steep terraces of the Portage Escarpment before reaching the relatively flat Erie Plain and draining into Lake Erie.
The Late stage of the Wisconsin glaciation (the last ice age) began about 85,000 years ago, and in Ohio reached as far south as the Portage Escarpment before stopping.
This ice sheet not only shaped the relief of the land—leaving behind low rounded hills, irregular plains, and depressions that turned into wetlands—but also left glacial till and erratics over most of the bedrock.
A low morainic ridge, the Euclid Moraine, appears east of Euclid Creek.
This morainic ridge extends 2 miles (3.2 km) to Willoughby, Ohio, from Euclid Creek.
A portion of the east branch flows along the south edge of this moraine.
Euclid Creek flows over bedrock more than 360 million years old. This includes the 365 million year old Chagrin Shale, the 360 million year old Cleveland Shale, the 358.9 million year old Bedford Formation, the 360 million year old Berea Sandstone, and the 354.8 to 351.4 million year old Orangeville Shale of the Cuyahoga Formation. The Berea Sandstone is highly resistant to erosion, and the highest waterfalls on Euclid Creek occur where the stream has cut down to the Berea.
Topographically, the underlying geology creates three distinct areas: The Allegheny Plateau, the Portage Escarpment, and the Erie Plain. The headwaters of both the main and east branch are located on the Allegheny Plateau. The two streams descend over the steep terraces of the Portage Escarpment before reaching the relatively flat Erie Plain and draining into Lake Erie. The Late stage of the Wisconsin glaciation (the last ice age) began about 85,000 years ago, and in Ohio reached as far south as the Portage Escarpment before stopping. This ice sheet not only shaped the relief of the land—leaving behind low rounded hills, irregular plains, and depressions that turned into wetlands—but also left glacial till and erratics over most of the bedrock. A low morainic ridge, the Euclid Moraine, appears east of Euclid Creek. This morainic ridge extends 2 miles (3.2 km) to Willoughby, Ohio, from Euclid Creek. A portion of the east branch flows along the south edge of this moraine.
Euclid Creek