In various places in Europe burial pits have been found containing the cremated remains of local inhabitants.

While cremation burial is possible, usually cremation is used. At this period in time, one uses burial over grave since one grave (barrow) might contain several burials and there is no grave registration to create plots. Grave or grave pit is used only when the actual hole is spoken of, which is tricky to decide often. Generally I err on the side of burial.

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Note added at 3 hrs (2009-08-05 17:29:48 GMT)
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I work with professional archaeology texts and 'burial pit for cremated remains' is far too long to be repeated every other sentence. If you google cremation + barrow, you will see that pit is not generally used. If you add burial pit, the result drops from 38 thousand to 381. There is a dictionary for archaeology compiled by Kazekevicius, but it is long out of date (1996). This field is technical, has its own jargon, and the available dictionary entries are not always correct. Many times you have to work from pictures. So be careful translating the terms.

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Note added at 4 hrs (2009-08-05 18:22:25 GMT)
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There is a time when something like 'burial pit with cremated remains' is used and that is when it is uncertain that they are human remains. Animal remains would make it a sacrificial pit, not a cremation.

Incidentally, the above cited article does not use 'burial pit with cremated remains'; it uses 'burials, including cremated remains'. Google gives no hits for the former.

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Note added at 1 day11 mins (2009-08-06 14:28:06 GMT)
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I used to use 'cremation burial' in translations until I encountered cremation in that sense.

cremation grave + archaeology gives 828 hits on Google
cremation burial + archaeology gives 4880 hits
cremations + archaeology -cremations gives 20 700 hits

I used archaeology because tenth century falls into that category. I used cremations instead of cremation to avoid the adjectival use and used -cremation to counteract Google's broad based search.

Another indicator of this meaning is 'primary cremation(s)' (334 + 49 hits), which cannot have any other meaning than a 'primary burial of cremated remains'.

In case you are wondering
burial + archaeology yields 1 260 000 hits
grave + archaeology yields 675 000 hits
primary burial + archaeology yields 2 520 hits
primary grave + archaeology yields 305 hits

So you can see that burial is preferred 2/1, and cremation is preferred over cremation burial / grave.

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Note added at 1 day25 mins (2009-08-06 14:41:37 GMT)
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primary cremation burial + archaeology yields 13 hits
primary cremation grave + archaeology yields 0 hits
primary inhumation burial + archaeology yields 7 hits
primary inhumation grave + archaeology yields 0 hits

In case someone thinks that 'primary cremation' is an incomplete phrase.

Although judging is closed, these sites also work a forum. In that spirit, I would like to point out a bit of text I just encountered 'degintinio kapo 3 duobė', which clearly shows the pit is a separate concept from the burial itself. Interestingly, 'cremation pit ' alone is more popular than grave/burial pit, although not when combined with the term 'archaeology'