Conglomerates belong to a group of sedimentary rocks called clastic sedimentary rocks.

Here's why:

* Clastic sedimentary rocks are formed from fragments of pre-existing rocks. These fragments, called clasts, are transported and deposited by wind, water, or ice.

* Conglomerates are specifically clastic sedimentary rocks composed of rounded clasts that are larger than 2 millimeters in diameter. These clasts are typically cemented together by minerals like calcite or quartz.

So, conglomerates are a type of clastic sedimentary rock, specifically characterized by their rounded, large clasts.