Example sentences of "[det] [noun] occur at the [noun sg] " in BNC.

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1 This change occurred at the beginning of the Paleozoic era starting with the Cambrian period , about 570 to 700 million years ago .
2 Some sedimentation occurs at the chamber floor but crystal concentration increases with time .
3 Subsequent research has documented that this effect occurs at the B- and T-cell levels .
4 Quite a surprise regarding this name occurred at the end of the last war .
5 In the most colonial species this chase is omitted and all courtship occurs at the nest .
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