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Peter_Wilders
Guest
Originally Posted by Neil_Anthony
The explanation is given by Pierre Julien on the glass-board in the video. He makes it clear that sedimentary particles transported by a current are deposited according to size. Additionally, as they prograde in the direction of the current, the later deposits must automatically be younger then those that preceded (t.1; t.2 and t.3 sequence as shown in the video)
The diagram below shows Orogeny is correct regarding the old deeper particle and the young higher one. This feature is quite normal viewing a single vertical line after deposit, but only in a vertical line. It cannot be extrapolated to the whole deposit as Julien’s diagram in the video and the one below demonstrate.
Peter
Didn’t you watch the video?
Orogeny: Yes, I have watched the video.
Neil…the layers are deposited from the side, not from the top.
Orogeny: Actually, they are deposited both above and laterally. Technically, it is called prograding and has been known to geologists for a very, very long time.
Orogeny goes on to explain the reason why he says “they are deposited both above and laterally”.Neil…What scientists call the ‘old’ bottom layers could be new or old.
His reason only refers to a single vertical line; it cannot be applied to the whole layer which is prograding in time.….In his own experiment (Berthault’s), the deeper layer is the one laid down first. Only if you change the reference frame of above and below from vertical (top to bottom) to oblique do you possibly find sediment that is younger beneath sediment that is older.
The explanation is given by Pierre Julien on the glass-board in the video. He makes it clear that sedimentary particles transported by a current are deposited according to size. Additionally, as they prograde in the direction of the current, the later deposits must automatically be younger then those that preceded (t.1; t.2 and t.3 sequence as shown in the video)
The diagram below shows Orogeny is correct regarding the old deeper particle and the young higher one. This feature is quite normal viewing a single vertical line after deposit, but only in a vertical line. It cannot be extrapolated to the whole deposit as Julien’s diagram in the video and the one below demonstrate.
Code:
Sorry, unable to send the diagram. It is incompatible with the forum format. I can send it by mail, if anyone wants. Julien's video explanation is even better.