during the carboniferous period were there any glaciers in the north of england (castleton to be precise) that melted causing the sea levels to rise?

[fashionjunk]

i really need to know, also could this have made it rise more than once? if not was there anything else that could have done this?

[Huderon]

Don't know for sure, but looking at maps covering that era, I'd say no to glaciers in England - they were concentrated around the South Pole, covering chunks of what are now Africa, India, Australia, South America and bits of Asia (have a look for a map of Gondwanaland which shows the modern bits of land we know now). Europe and North America would have been in more tropical zones and not affected by glaciers at that time.

[gen2]

Melting of land ice would cause global rises in sea level so the glaciers wouldn't have to be local. If the glaciers were local, then after the melt and sea level rise, the sea level would appear to fall again as the land bounces back up (isostacy).

Apparent rises in local sea level can be caused by sinking of the land. Three possibilities:
1. Movement along fault lines
2. Plastic deformation (synclines)
3. Settling and compression of delta deposits

Combinations of any of the above are possible.

[heathfield]

The carboniferous period is named for the time when coal deposits were laid down. Coal is formed from decaying plants which grew all over Britain.. These grew in a hot, steamy, tropical climate. So there could never have been any glaciers present where these plants were growing - otherwise the cold would have killed them all off.
There have been many Ice Ages, and sea levels have risen and fallen many times as the Ice Ages have come and gone.