328ct Layered Ironstone Nodule – Arundel Formation, Baltimore County, Maryland, USA

This 328-carat layered ironstone nodule comes from the Arundel Formation in Baltimore County, Maryland, a well-known early Cretaceous unit famous for its iron-rich concretions and distinctive sedimentary structures.

The specimen shows well-defined natural layering, with attractive bands of red-brown, ochre, and dark ironstone tones. Its robust shape, surface texture, and color contrast make it an eye-catching geological piece with strong display appeal. Arundel ironstone nodules are sought after by collectors of U.S. locality material, sedimentary structures, and unique natural concretions.

Weight: 328ct
Material: Layered Ironstone Nodule
Formation: Arundel Formation (Early Cretaceous)
Locality: Baltimore County, Maryland, USA

A striking and collectible layered ironstone nodule from a classic Mid-Atlantic geological formation—excellent for display or collection.