1. sedimentary rocks formed from ancient glacial deposits, typically containing unsorted rock fragments in a fine-grained matrix
Usage: geological

Examples

• The geologist identified tillites in the rock formation, indicating past glacial activity.
• These tillites provide evidence of ice ages that occurred millions of years ago.
• The unsorted nature of the rock fragments in tillites distinguishes them from other sedimentary rocks.
• Researchers studied the tillites to understand ancient climate patterns.
• The presence of tillites suggests this region was once covered by glaciers.
• Tillites often contain scratched and polished stones carried by ancient ice sheets.