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The sedimentary rock exposures on Wren's Nest Hill near Dudley, West Midlands, are Wenlock Limestone. The use of geological hammers is not allowed at the site, and only loose fallen rocks and scree should be foraged for specimens.

The Silurian Wenlock deposits occurred in shallow seas approximately 420-435 million years ago. The limestone layer has a maximum thickness of 29 metres (about 95 feet) above layers of siltstone and mudstone ten times as thick. It contains an extraordinary concentration of marine fossils, such as brachiopods, corals, trilobites, clams, bryozoans and crinoids.
One of the trilobites is the famous Dudley Bug, Calymene blumenbachii.
There are many very informative websites available on-line.

Source: Link
November 2022.