Abstract: An apparatus and a method to obtain continuous undisturbed sampling, by rotational boring in non-plastic granular tills. The designation of non-plastic granular till refers to a heterogeneous glacial deposit containing an unstratified and unsorted mixture of silt, sand, gravel, cobbles and boulders with no clay particles. In the geotechnical terminology, this material is generally classified as a gravely silty sand with variable percentage of cobbles and boulders (the non-cohesive matrix consisting of silt and sand). The apparatus comprises a string of drill rods having a core barrel and a new designed coring bit of preselected diameter secured at an end thereof. A drive rotates the drill rod at a predetermined rpm, dependent on the coring bit diameter, to impart rotation to the coring bit to penetrate the core barrel in the soil at a predetermined rate. The coring bit has a crown shaped drilling head having a plurality of fluid convection channels therein.