Written by the TreasureGuide for the exclusive use of treasurebeachesreport.blogspot.com.
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Bogota Two Escudo in Sedwick Auction (Lot 30)
Source: Current Sedwick Auction Listing.
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Have you heard of the Mesuno Hoard? The Mesuno Hoard consists of Bogota two escudos from the early years of the Bogota mint. They are mostly dated 1628 to 1635.
The hoard was found by a poor fisherman who found a chest full of gold coins in 1936 in the Magdalena River near Honda, Columbia, when he went to check his fishing lines. He shared the coins with his two brothers.
It seems that a boat carrying a shipment of coins to Cartagena was lost in the river. From what I've seen of photos of the river today, it wouldn't have been a large boat.
I recommend that you read the very interesting and detailed Sedwick article about the hoard.
Here is the link.
https://www.sedwickcoins.com/articles/mesuno.htm
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The hoard was found by a poor fisherman who found a chest full of gold coins in 1936 in the Magdalena River near Honda, Columbia, when he went to check his fishing lines. He shared the coins with his two brothers.
It seems that a boat carrying a shipment of coins to Cartagena was lost in the river. From what I've seen of photos of the river today, it wouldn't have been a large boat.
I recommend that you read the very interesting and detailed Sedwick article about the hoard.
Here is the link.
https://www.sedwickcoins.com/articles/mesuno.htm
---
Yesterday I described two ways that cuts are formed on a beach. The first is when the water hits at an angle and slices away the sand. The second is when the water hits the beach straight on. It seems to me that the second method does not happen often on a real beach. Beaches don't cut real often anyhow unless there is something that makes the beach especially vulnerable, such as jetties, rocks, or renourishment sand piled where there otherwise would not be much sand.
A wave tank is obviously not exactly like a natural beach. The wave tank has walls that channels the water both incoming and returning and also keeps the sand from spreading to the right or left. In the wave tank, the waves are also equally spaced and of the same approximate magnitude. At least that was the case in the video I posted yesterday. If you watch waves hit at one of the local beaches, you will see they vary a lot. You'll often see waves coming from two different directions. They are not equally spaced, and as the tide comes and goes so the water moves higher and lower on the beach, unlike what was demonstrated with the wave tank.
With the cuts created in the wave tank, I observed three stages. First there was erosion that caused the slope to become more steep. Then the upper edge of the slope collapsed. And then the cut increased in size and moved back on the beach.
Long ago I showed how water slamming into the face of the cliff causes slabs of sand to separate and fall to the base of the cut to be washed away by the waves that follow. For that to continue the water level must increase or at least remain high. If the water starts backing off, the cliff will not continue to develop. As long as the water continues to slam into the cliff, the cut will slowly move back on the beach.
I haven't yet explained how cuts create hot spots. I'll have to do that some another time.
If the water remains high or increases because of storm surge or an incoming tide, the water will be hitting the cliff with a lot of force and bouncing the water back down the slope. When you have that kind of force moving back down the slope, more sand and other things will be carried with it. The only thing to stop it would be the incoming waves.
For sand to be moved by water flowing over it, it first has to become suspended. It takes more force to suspend sand or other materials, but once it is suspended, it takes less force to move it than it took to dislodge it from its resting place.
The sand in front of a cut will be repeatedly washed and permeated with each incoming wave. I( believe that repeatedly crashing waves can cause liquefaction.
Here is a video showing how shaking saturated sand will behave when it is shaken.
This is something that I've not been able to observe, but I suspect that if the sand becomes liquefied, it will flow off the beach at a faster rate, and secondly it will fail to support the sand on the slope above it.
I observed that effect myself. If you are near the swash area where the sand is near the edge, if you step on it, it will quickly give way. The sand above that, which is not as saturated and firmer, will hold your weight, leaving only an impression of your foot.
When the sand gives way, the sand immediately behind it also loses some of its support.
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I know that some of you won't be very interested in beach dynamics, but I am, and if you understand it better, you'll be better able to determine when and where cuts will occurs and what will happened to the coins and other objects. Then you'll have a better idea of where to spend your time.
I colored some grains and put them in the small surf and traced their movement. Hopefully my video came out well and I'll be able to show you that in the near future. I'm afraid there was too much glare on the water.
I'll also talk more about cuts and how objects will move relative to them.
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I'm sure you all saw images of the fire at Notre Dame Cathedral. Anyone interested in history had to be saddened by the loss of such a historic building. Began nearly six hundred years before the 1715 Fleet sailed, it survived hundreds of years of history including the French Revolution, Napoleon Bonaparte, and World Wars, and was the residence of sacred relics such the Crown of Thorns, a stone from the Holy Sepulchre, and wood and a nail from the cross and many works of art, some of which were saved.
The tides are getting bigger, but there won't be much surf for several days.
Easter, if I correctly recall, falls on the first Sunday, after the first full moon, after the Spring equinox.
Happy hunting,
TreasureGuide@comcast.net
A wave tank is obviously not exactly like a natural beach. The wave tank has walls that channels the water both incoming and returning and also keeps the sand from spreading to the right or left. In the wave tank, the waves are also equally spaced and of the same approximate magnitude. At least that was the case in the video I posted yesterday. If you watch waves hit at one of the local beaches, you will see they vary a lot. You'll often see waves coming from two different directions. They are not equally spaced, and as the tide comes and goes so the water moves higher and lower on the beach, unlike what was demonstrated with the wave tank.
With the cuts created in the wave tank, I observed three stages. First there was erosion that caused the slope to become more steep. Then the upper edge of the slope collapsed. And then the cut increased in size and moved back on the beach.
Long ago I showed how water slamming into the face of the cliff causes slabs of sand to separate and fall to the base of the cut to be washed away by the waves that follow. For that to continue the water level must increase or at least remain high. If the water starts backing off, the cliff will not continue to develop. As long as the water continues to slam into the cliff, the cut will slowly move back on the beach.
I haven't yet explained how cuts create hot spots. I'll have to do that some another time.
If the water remains high or increases because of storm surge or an incoming tide, the water will be hitting the cliff with a lot of force and bouncing the water back down the slope. When you have that kind of force moving back down the slope, more sand and other things will be carried with it. The only thing to stop it would be the incoming waves.
For sand to be moved by water flowing over it, it first has to become suspended. It takes more force to suspend sand or other materials, but once it is suspended, it takes less force to move it than it took to dislodge it from its resting place.
The sand in front of a cut will be repeatedly washed and permeated with each incoming wave. I( believe that repeatedly crashing waves can cause liquefaction.
Here is a video showing how shaking saturated sand will behave when it is shaken.
This is something that I've not been able to observe, but I suspect that if the sand becomes liquefied, it will flow off the beach at a faster rate, and secondly it will fail to support the sand on the slope above it.
I observed that effect myself. If you are near the swash area where the sand is near the edge, if you step on it, it will quickly give way. The sand above that, which is not as saturated and firmer, will hold your weight, leaving only an impression of your foot.
When the sand gives way, the sand immediately behind it also loses some of its support.
---
I know that some of you won't be very interested in beach dynamics, but I am, and if you understand it better, you'll be better able to determine when and where cuts will occurs and what will happened to the coins and other objects. Then you'll have a better idea of where to spend your time.
I colored some grains and put them in the small surf and traced their movement. Hopefully my video came out well and I'll be able to show you that in the near future. I'm afraid there was too much glare on the water.
I'll also talk more about cuts and how objects will move relative to them.
---
I'm sure you all saw images of the fire at Notre Dame Cathedral. Anyone interested in history had to be saddened by the loss of such a historic building. Began nearly six hundred years before the 1715 Fleet sailed, it survived hundreds of years of history including the French Revolution, Napoleon Bonaparte, and World Wars, and was the residence of sacred relics such the Crown of Thorns, a stone from the Holy Sepulchre, and wood and a nail from the cross and many works of art, some of which were saved.
The tides are getting bigger, but there won't be much surf for several days.
Easter, if I correctly recall, falls on the first Sunday, after the first full moon, after the Spring equinox.
Happy hunting,
TreasureGuide@comcast.net
