Beta rhythms are ubiquitous in the motor cortex, and many functional roles were proposed. We recently described a double-dissociation between different beta bands in macaques local field potential (LFP), with low beta (<20Hz) originating in primary motor cortex (M1) and correlating with movement preparation and spontaneous postural dynamics, and high beta (>20Hz) originating in dorsal premotor cortex (PMd) and reflecting spatiotemporal attention (Nougaret et al. 2023, doi:10.1101/2023.03.28.534535). Even within these two bands, individual beta events are highly heterogeneous in their temporal, spectral and spatial dynamics. We here explore spectro-spatial beta rhythm patterns in motor cortical laminar recordings in two male macaques during visuomotor behavior, to determine their relationship to different aspects of the task and performance. The patterns underwent fluctuations in amplitude, and we termed moments with relatively high amplitude of a given pattern "crackles". Crackles resemble "bursts”, although their overall amplitude might be weak compared to total LFP power in the beta range. The rates of occurrences of crackles for individual patterns were characteristically modulated by the task, becoming useful features for decoding. Specifically, we decoded behavioral and task parameters from the "instantaneous" crackling rate of the patterns within single trials. To estimate the spread of information in the cortical column, we studied the cross-decoding capabilities across patterns. We found cross-decoding blocks, suggesting that ‘decoding grammars’ are compatible but not identical across different lamina. In conclusion, beta power can be decomposed into behaviorally relevant spectro-laminar patterns which might reflect specific neuronal subpopulations or network states.