Integrated assemblies, and methods of forming integrated assemblies

An integrated assembly comprising:

• a memory array region which includes channel material pillars extending through a stack of alternating conductive levels and insulative levels;
• a staircase region offset from the memory array region and comprising staggered terminal regions of the conductive levels;
• an intervening region between the staircase region and the memory array region, the intervening region being distinct from and non-overlapping the staircase region and the memory array region and comprising a plurality of regions of the stack of alternating conductive levels and insulative levels, the plurality of regions of the stack including a first region of the stack, a second region of the stack and a third region of the stack;
• the intervening region including slabs of insulative material extending through the stack, and including bridging regions laterally adjacent said slabs;
• two spaced-apart slabs being along a cross-section;
• the spaced-apart slabs being a first slab and a second slab;
• a first bridging region comprising the first region of the stack being between the first and second slabs, a second bridging region comprising the second region of the stack being on an opposing side of the first slab from the first bridging region, and a third bridging region comprising the third region of the stack being on an opposing side of the second slab from the first bridging region;
• a first series of slits within the intervening region, each slit comprised by the first series of slits having a depth, a width and a length that exceeds the width with each slit extending lengthwise along the bridging regions and into a plane of the cross-section;
• the first series including a first slit within the first bridging region, a second slit within the second bridging region and a third slit within the third bridging region;
• a second series of slits extending through the slabs, with the slits of the second series being parallel to the slits of the first series;
• the second series including a fourth slit within the first slab and a fifth slit within the second slab;
• first panels within the slits of the first series;
• and
• second panels within the slits of the second series;
• the second panels being compositionally different from the first panels.