Have you noticed those circles around the tidepool entrance? They’re not dinosaur footprints or asteroid impact craters. They’re concretions, a fascinating geological feature. Let’s dive into what makes them so special. A concretion is a solid, tightly packed mass of minerals that forms inside sedimentary rock, often with a round shape. Concretions happen when minerals from groundwater settle and stick the sediment together, usually around … Continue reading Did You Know – Concretions – What are They?