Wall block system

A wall block comprising:

• an upper surface and a lower surface;
• and
• a front portion defining a front surface of the block, a rear portion, and an intermediate portion extending between and interconnecting the front portion and the rear portion;
• wherein the intermediate portion defines a minimum spacing (D3) measured from an outer side surface of the intermediate portion to another, opposing outer side surface of the intermediate portion;
• wherein the rear portion comprises a first tail section and a second tail section positioned on opposite sides of a first imaginary line extending from the front portion to the rear portion and bisecting the block, wherein each of the first and second tail sections comprises a forward facing first surface and an opposing rearward facing second surface;
• first and second protrusions formed on the upper surface of the block, wherein the first and second protrusions are located on opposite sides of the first imaginary line and are closer to the second surfaces of the tail sections than they are to the front surface of the block;
• wherein an outboard side of the first protrusion is spaced a distance (D4) from a second imaginary line that is parallel to the first imaginary line and intersects a lateral most location of a first side of the block;
• wherein an outboard side of the second protrusion is spaced the distance (D4) from a third imaginary line that is parallel to the first imaginary line and intersects a lateral most location of a second side of the block;
• wherein the minimum spacing (D3) is less than twice the distance (D4).

A wall comprising:

• at least a first lower course and a second upper course overlying the first course, wherein each course comprises a plurality of first blocks;
• wherein each first block comprises:
• an upper surface and a lower surface;
• a front portion defining a front surface of the block, a rear portion, and an intermediate portion extending between and interconnecting the front portion and the rear portion;
• wherein the intermediate portion defines a minimum spacing (D3) measured from an outer side surface of the intermediate portion to another, opposing outer side surface of the intermediate portion;
• wherein the rear portion comprises a first tail section and a second tail section positioned on opposite sides of a first imaginary line extending from the front portion to the rear portion and bisecting the block, wherein each of the first and second tail sections comprises a forward facing first surface and an opposing rearward facing second surface;
• first and second protrusions formed on the upper surface of the block, wherein the first and second protrusions are located on opposite sides of the first imaginary line and are closer to the second surfaces of the tail sections than they are to the front surface of the block;
• wherein an outboard side of the first protrusion is spaced a distance (D4) from a second imaginary line that is parallel to the first imaginary line and intersects a lateral most location of a first side of the block;
• wherein an outboard side of the second protrusion is spaced the distance (D4) from a third imaginary line that is parallel to the first imaginary line and intersects a lateral most location of a second side of the block;
• wherein the minimum spacing (D3) is less than twice the distance (D4):
• wherein the protrusions of the first blocks in the first course engage respective forward facing first surfaces of tail sections of respective first blocks in the second course such that the first blocks in the second course are set back relative to the first blocks in the first course.