Memory arrays comprising strings of memory cells and methods used in forming a memory array comprising strings of memory cells

A memory array comprising strings of memory cells, comprising:

• a conductor tier comprising conductor material;
• laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above the conductor tier, conducting material of a lowest of the conductive tiers being directly against the conductor material of the conductor tier, channel-material strings of memory cells extending through the insulative tiers and the conductive tiers;
• intervening material laterally-between and longitudinally-along immediately-laterally-adjacent of the memory blocks, the intervening material comprising insulating material that is directly against the conductor material of the conductor tier;
• the conducting material in the lowest conductive tier being directly electrically coupled to the channel material of individual of the channel-material strings;
• and
• the conducting material of the conductive tiers that are above the lowest conductive tier projecting laterally in a direction away from the channel-material strings into the insulating material of the intervening material.

A memory array comprising strings of memory cells, comprising:

• a conductor tier comprising conductor material;
• laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above the conductor tier, conducting material of a lowest of the conductive tiers being directly against the conductor material of the conductor tier, channel-material strings of memory cells extending through the insulative tiers and the conductive tiers;
• intervening material laterally-between and longitudinally-along immediately-laterally-adjacent of memory blocks, the intervening material comprising insulating material that is directly against the conductor material of the conductor tier;
• the conducting material in the lowest conductive tier being directly electrically coupled to the channel material of individual of the channel-material strings;
• and
• the insulating material of the intervening material projecting laterally in a direction towards the channel-material strings to be directly under a lowest of the insulative tiers.