In the USCS, particles with a size greater than 75 mm are classified as:

In the Unified Soil Classification System (USCS), particles that are larger than 75 mm are identified as cobbles. This classification is crucial for geotechnical engineering and soil mechanics because it helps engineers and geologists determine the appropriate methods for analyzing and constructing with the material in question.

Cobbles are larger than gravel, which is classified as particles ranging from 4.75 mm to 75 mm. Recognizing this distinction is important when assessing soil properties for construction projects, as the behavior of cobbles differs significantly from that of smaller particles. This difference impacts drainage, stability, and load-bearing capabilities of soil and rock layers.

The classification also helps in communication among professionals in the field, ensuring everyone is on the same page when discussing soil types and their implications in design and construction processes. Understanding the sizes and classifications aids in more informed decision-making regarding material selection, construction techniques, and environmental considerations in engineering projects.