*4.2. Aerial Photography*

An aerial photo from the drone flight on 28 April 2019 (Figure 3) shows the distinct partial-ring shape of the Almeja CBB appended against the flank of basement rocks on the west side of the headland. The boulder field does not extend into the ring's central depression. Width of the enclosing ring is greatest adjacent to the front of the headland and most narrow some 120 m back along the fault margin with basement rocks. A small patch of standing water occurs within the circular green zone close to the north inner wall of the ring.

**Figure 3.** Aerial view directly above the Ensenada CBB showing the half-ring arrangemen<sup>t</sup> of the deposit on the west flank of the bedrock ridge. White rectangle on the nose of the headland marks location shown in the following field photograph (Figure 4).
