Posts Tagged ‘pebble’

A liquorice allsort pebble

April 22, 2016

Plain sandy beaches don’t quite cut the mustard with me. Yes, I loved them when I was a kid and could use whatever tools were to hand to do a spot of beach engineering. Although probably unsure as to what a canal was, that’s what I liked to build. I wanted an incoming tide so I could build a waterway network above the current tide line and then allow it to flood and fill with water – and rapidly get washed away, of course.

But now a plain sandy beach backed by sea defence walls and without much else seems the dullest kind of beach. I’d like to have some pebbles as well so that interesting ones can be found.

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Now this stone looks a bit ordinary from the top.

It’s just a plain brown pebble with a flat surface (it would be great for skimming across the water) and nicely smoothed by the action of the sea.

You have to look at the edge to see its real loveliness.

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Did you ever see anything more like one of the delicious brown sandwich liquorice allsorts?

But it isn’t that at all, it is a pebble and there must have been some change in circumstances whilst the sediment it was made from was laid down and compressed. If I was more of a geologist maybe I’d know what mineral created the brown layers and what happened to cause the black in the middle.

For now, this little pebble, about five centimetres across, is just for enjoyment. It came from St Helens Duver on the Isle of Wight.

A holey pebble

August 17, 2015

No, I certainly don’t mean a holy pebble. Nor do I mean a pebble which is wholly a pebble. I mean one with holes through it.

This little pebble, not much more than a centimetre in size in any direction was picked up in the Isle of Wight last month. I had this idea that if I brought it home it might remind me to find out what created five little holes right through this small beach pebble.

image002You can definitely see through two of the holes but trust me, all five go through. We can also see a kind of double bore appearance.

Let’s flip the pebble over.

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Again, we have clear vision through two of the holes.

So what makes them? Well I’m still not 100% sure.

There is a good page about holey stones at https://natureinfocus.wordpress.com/2011/04/09/pebbles-with-holes-made-by-sea-creatures/  Jessica who writes this blog tells us they are caused by certain bivalve molluscs, polychaete worms and even sponges. But she then concentrates on the bigger holes made by those molluscs which are called piddocks, But these are small holes so maybe they are made by those worms.

By the way, I don’t think these stones are lucky, magical or anything like that. I just have a desire to know what caused the holes.

Can anyone offer sensible suggestions please?