<a href="https://en.wikipedia.org/wiki/Sandstone" class="extiw" title="w:Sandstone">Sandstone</a> <a href="https://en.wikipedia.org/wiki/Concretions" class="extiw" title="w:Concretions">Concretion</a> in the wall at the beach of <a href="https://en.wikipedia.org/wiki/A%C3%B1o_Nuevo_State_Reserve" class="extiw" title="w:Año Nuevo State Reserve">Año Nuevo State Reserve</a>. This concretion was too high in the wall to place a ruler, but I estimate it to be about 400 mm long. <br> Please take a look at additional two images, which help you to see the settings of the image better: The first image shows the beach wall with two concretions and the second image is the wide angle image of the wall<br><a href="//commons.wikimedia.org/wiki/File:Concretions.JPG" class="image"><img alt="Concretions.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Concretions.JPG/64px-Concretions.JPG" decoding="async" width="64" height="43" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Concretions.JPG/96px-Concretions.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Concretions.JPG/128px-Concretions.JPG 2x" data-file-width="3888" data-file-height="2592"></a><br><a href="//commons.wikimedia.org/wiki/File:Beach_wall_with_concretions.JPG" class="image"><img alt="Beach wall with concretions.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Beach_wall_with_concretions.JPG/64px-Beach_wall_with_concretions.JPG" decoding="async" width="64" height="43" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Beach_wall_with_concretions.JPG/96px-Beach_wall_with_concretions.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Beach_wall_with_concretions.JPG/128px-Beach_wall_with_concretions.JPG 2x" data-file-width="3888" data-file-height="2592"></a> <br> This same wall has lots of <a href="https://en.wikipedia.org/wiki/en:Fossil" class="extiw" title="w:en:Fossil">Fossils</a> inclusions:<br><a href="//commons.wikimedia.org/wiki/File:Fossils_in_a_beach_wall.JPG" class="image"><img alt="Fossils in a beach wall.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Fossils_in_a_beach_wall.JPG/64px-Fossils_in_a_beach_wall.JPG" decoding="async" width="64" height="43" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Fossils_in_a_beach_wall.JPG/96px-Fossils_in_a_beach_wall.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Fossils_in_a_beach_wall.JPG/128px-Fossils_in_a_beach_wall.JPG 2x" data-file-width="3888" data-file-height="2592"></a><br><a href="//commons.wikimedia.org/wiki/File:Beach_wall_with_fossil_shells.jpg" class="image"><img alt="Beach wall with fossil shells.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Beach_wall_with_fossil_shells.jpg/64px-Beach_wall_with_fossil_shells.jpg" decoding="async" width="64" height="48" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Beach_wall_with_fossil_shells.jpg/96px-Beach_wall_with_fossil_shells.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Beach_wall_with_fossil_shells.jpg/128px-Beach_wall_with_fossil_shells.jpg 2x" data-file-width="3072" data-file-height="2304"></a>.<br>The <a href="https://en.wikipedia.org/wiki/Concretions" class="extiw" title="w:Concretions">Concretions</a> often get weathered out from the wall. At the next image you could see few spheres <a href="https://en.wikipedia.org/wiki/Concretions" class="extiw" title="w:Concretions">Concretions</a>, which were found in a close proximity.<br><a href="//commons.wikimedia.org/wiki/File:Sscan.JPG" class="image"><img alt="Sscan.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Sscan.JPG/64px-Sscan.JPG" decoding="async" width="64" height="43" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Sscan.JPG/96px-Sscan.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Sscan.JPG/128px-Sscan.JPG 2x" data-file-width="3888" data-file-height="2592"></a>
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<span class="int-own-work" lang="en">Own work</span>