Circular crop mark?

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Steve_T
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Re: Circular crop mark?

Post by Steve_T » Mon Jul 03, 2017 6:03 pm

I've had a thought about your first post, you mentioned it was 200 metres away from a brook, is this area prone to flooding? difficult to tell from the photos level of the land. if it was it may indicate a possible structure as this is a defined area that is built up.

If it has been built up to protect from the highest know flood, check this link out to see, just put the postcode in and drag the map to the area. It is from the Environment Agency

https://flood-map-for-planning.service.gov.uk/

I have another link somewhere that is is more comprehensive in my HNC research paperwork, if I can locate it.

Regards Steve


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Devon J
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Re: Circular crop mark?

Post by Devon J » Mon Jul 03, 2017 9:29 pm

Interesting read, many thanks. I hope you find your answers. the finds look good. I dont have any marks like that on my permissions, that I know of, but the Lidar link has opened my eyes, I will be having a good look at the land with the lidar link. Many Thanks .
Jason

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Easylife
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Re: Circular crop mark?

Post by Easylife » Tue Jul 04, 2017 12:17 am

Lidar only emphasizes the ridge and furrows. Nothing shows at all of the other soil marks. It is about halfway up a hill, so no chance of flooding at all. On the ground the circular feature does not appear built up, it seems to be at the same level as surrounding ground, apart from the 2' drop into the field downslope.
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Re: Circular crop mark?

Post by Easylife » Tue Jul 11, 2017 10:21 pm

I am now quite sure that the large circular feature is a "fairy ring". For those who do not know about "fairy rings", they are basically caused by a fungal disease which converts organic matter into nitrogen which greens-up the grass. I dug a target which was in the dark green area, the soil was heavily compacted with clear saturation of mycelia (white fungus spores). I noticed that there are also many smaller fairy rings of about a metre wide over a large area. A common cause is lack of aeration of the soil and this pasture has not been ploughed for possibly 100 years. There are still other unexplained soil marks to figure out.
It is interesting that there are different types of finds in different fields, which have all been pasture for a long time. The smallest field of about 1/4 acre contained 6 horse harness decorations. The next smallest field of about 1 acre contained about 20 coins so far. An initial loop of a 5 acre field produced mainly locally identifiable finds such as buttons and tokens from about 1880 to 1920. In the largest fields targets are few and far between, crotal bell, rusty pen knife, and the odd coin. A separate group of small pasture fields produced mainly victorian era finds such as door knobs, barrel tap keys, pressed copper alloy mounts, etc. There are also several other fields I have yet to detect which may also have some find theme to them. It's maybe not too exciting ground for some, but It certainly gives a good choice, and of course there's always the chance of an unexpected nice find. It's also just a 5 min drive away so handy for even just a couple of hours anytime.
Wish I could have said it was a ploughed out barrow which spilled out gold torcs! :D
Deus V4.1, 11" coil, 9" HF coil, 2nd Garrett Carrot. %)=
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