Well, that explains a lot. Your Profile doesn't mention where you're from, but the report from which you speak is in Ireland. Different parts of the world use words in different ways; in England, a bonnet (in automotive terms) is what we in America call the hood.
In this case, however, the phrase "angular block" is just that - or as we would probably phrase it here, "angular rock". If you look on Page 12 of the Presentation, you'll see a pictured example of what they are talking about. Notice the angles of the rock. It's not rounded, as if from a river. It is angular, showing little signs of wear. In other words, the rock finds are probably very close to where the rock originated. The terrain doesn't look overly steep, therefore I wouldn't think that landslides could have taken the rock very far. However, there is also the possibility of glacial change, and whether or not that area had glaciers move through long, long ago that might have taken the rock far from it's original location.
Hope this helps some.
