If it was in the middle of other layers, then how could it be interpreted even without the idea of global flood? Do you mean the feature of preserved rain drop is physically impossible? If it is possible, then what is the objection? How would the layer above it have anything to do with having the global flood or not having the flood?
What?
Are you saying that the only way to explain ANY layering of sediments is with a global flood?
*Sigh*
Let me talk you through this...
According to flood apologists, the many layers of sediment we see were laid down very rapidly by the waters of Noah's flood. Each sediment was underwater when it was laid down.
On the other hand, science tells us that the layers of sediment were laid down one at a time over a great length of time. So one layer could be laid down, then the waters recede, then the next. Given the annual cycle of wet and dry seasons in many parts of the world, this is both plausible and observed today.
Now, we look at these layers when we dig them up. We see raindrop impacts in some of the layers (let's say Layer M), with other layers on top of them (layer L, K, J, I, H and so on).
The scientific explanation can explain this.
Waters come and deposit layer M. The waters then recede, exposing the wet mud of layer M to the air. Some rain comes - not enough to flood, but enough to leave raindrop impacts in Layer M. After the rain, the sun comes out and over the next several months, the mud of Layer M is baked hard by the dry season. Next year, the floods come again in the wet season, covering the rock hard layer M with a younger layer, layer L.
Flood geology can't explain it. For a raindrop to leave an impact crater, the layer of sediment must be exposed to the air (rain falls through the air - you don't get raindrops underwater). However, flood geology says that this never happened. Once Layer M was laid down by the flood, it was never exposed to the air again! By the time the flood waters had receded, Layer M had been covered by Layers L, K, J and so on.
So, according to flood geology, we should not be able to find ANY raindrop impacts, because the conditions made it impossible for raindrop impacts to occur. Since we do in fact find raindrop impacts, it proves that these layers of sediment could not have been laid down in a massive flood.