It seems that NASA scientists
have an increased interest in the paving stones that outcrop at the floor
of the Jezero crater.
Unfortunately, this assumption is not relevant. If there was a lake, sedimentary deposits from the lake would no longer exist. The P.S. are clearly of magmatic origin in their composition and are identical to the ultramafic stones from the moraine. The mineral composition (hornblende, olivine and Ca-pyroxene) is in the numerous close-ups of the P.S. to recognize.
The exclusively high degree of disintegration and the dense arrangement of the outcropping rock can lead to two conclusions:
Still unanswered, however, is the question of whether and where a boundary can be established between the friable or holey disintegrated stones on the surface that occure together with the P.S., that are spreading out in other places. However, regardless of the degree of weathering, there are stones lying in the ground that do not belong to it and possibly come from younger parts of the former moraine.
First photos from the landing site
Current photos from the "paving stone" ground
..... and the close-up of a abraded drilling place
These "paving stones" are very crumbly. Therefore, no core could be extracted from the first drilling.